| Reference number | Title | Date |
| EC/1863/03 | Crookes, Sir William: certificate of election to the Royal Society | |
| M/053 | Crookes, William | |
| IM/001004 | Crookes, Sir William | nd |
| MS/373/1/93 | Testimonial by William Crookes, The Chemical News, Boy Court, Ludgate Hill, London, supporting Thomas Edward Thorpe | 14 July 1870 |
| IM/001001 | Crookes, Sir William | nd |
| S/0005 | Sculpture bust of Crookes, Sir William | 1908 |
| CMB/10/1 | Minutes, meeting of the Glassworkers' Cataract Committee | 3 July 1908 |
| CMB/10/34 | Minutes, meeting of the Glassworkers' Cataract Committee | 25 March 1915 |
| CMB/10/29 | The preparation of eye-preserving glass for spectacles | 1910 |
| CMB/36/20 | Minutes, meeting of the War Committee | 18 November 1915 |
| CMB/10/20 | Report by Sir William Crookes on experiments done for the Glassworkers' Cataract Committee | 16 November 1910 |
| CMB/36/21 | Minutes, meeting of the War Committee | 9 December 1915 |
| CMB/10/14 | Report on experiments with coloured glass | 10 April 1909 |
| CMB/10/30 | Minutes, meeting of the Glassworkers' Cataract Committee | 11 February 1914 |
| CMB/36/15 | Minutes, meeting of the War Committee | 9 June 1915 |
| CMB/10/9 | Report on experiments at Messrs Nuttall & Co's Glass Works | 5 May 1909 |
| CMB/36/17 | Minutes, meeting of the War Committee | 1 July 1915 |
| CMB/36/19 | Minutes, meeting of the War Committee | 15 July 1915 |
| CMB/36/16 | Minutes, meeting of the War Committee | 24 June 1915 |
| NLB/34/56 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, Fellow of the Royal Society | 21 November 1906 |
| P/0028 | Portrait of Crookes, Sir William | 1911 |
| IM/Maull/000999 | Crookes, Sir William | nd |
| NLB/34/408 | Copy letter from Joseph Larmor, to Sir William Crookes, Fellow of the Royal Society | 17 January 1907 |
| IM/001002 | Crookes, Sir William | 1999 |
| CMB/10 | Glassworkers' Cataract Committee | July 1908 to June 1928 |
| CMB/28 | Chemistry War Committee | 1914 to 1918 |
| CMB/36 | War Committee of the Royal Society | November 1914 to May 1918 |
| NLB/41/21 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, Fellow of the Royal Society | 25 September 1909 |
| MC/14/122 | Letter from William Crookes, 7 Kensington Park, London, to the Council of the Royal Society | 8 April 1886 |
| NLB/4/469 | Copy letter from Herbert Rix, to William Crookes, Fellow of the Royal Society | 9 June 1890 |
| NLB/2/809 | Copy letter from Herbert Rix, to John Evans, Treasurer, Royal Society | 9 November 1888 |
| NLB/2/765 | Copy letter from Michael Foster, to William Crookes, Fellow of the Royal Society | 1 November 1888 |
| NLB/3/271 | Copy letter from Herbert Rix, to William Crookes, Fellow of the Royal Society | 26 April 1889 |
| NLB/3/304 | Copy letter from Herbert Rix, to William Crookes, Fellow of the Royal Society | 4 May 1889 |
| NLB/6/307 | Copy letter from Herbert Rix, to William Crookes, Fellow of the Royal Society | 11 April 1892 |
| NLB/6/514 | Copy letter from Herbert Rix, to William Crookes, Fellow of the Royal Society | 26 May 1892 |
| NLB/34/600 | Copy letter from Joseph Larmor, to Sir William Crookes, Fellow of the Royal Society | 13 February 1907 |
| NLB/5/287 | Copy letter from Herbert Rix, to Messrs Drake & Gorham | 29 April 1891 |
| NLB/5/446 | Copy letter from Herbert Rix, to William Crookes, Fellow of the Royal Society | 12 June 1891 |
| NLB/30/517 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, Fellow of the Royal Society | 6 April 1905 |
| NLB/10/911 | Copy letter from Herbert Rix, to William Crookes, Fellow of the Royal Society | 5 March 1895 |
| NLB/33/55 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, Fellow of the Royal Society | 22 June 1906 |
| NLB/10/748 | Copy letter from Herbert Rix, to William Crookes, Fellow of the Royal Society | 30 January 1895 |
| NLB/10/929 | Copy letter from Herbert Rix, to William Crookes, Fellow of the Royal Society | 11 March 1895 |
| NLB/10/724 | Copy letter from Herbert Rix, to William Crookes, Fellow of the Royal Society | 26 January 1895 |
| NLB/11/65 | Copy letter from Herbert Rix, to William Crookes, Fellow of the Royal Society | 9 April 1895 |
| NLB/10/969 | Copy letter from Herbert Rix, to William Crookes, Fellow of the Royal Society | 15 March 1895 |
| NLB/10/1049 | Copy letter from Herbert Rix, to William Crookes, Fellow of the Royal Society | [March] 1895 |
| NLB/11/282 | Copy letter from Herbert Rix, to William Crookes, Fellow of the Royal Society | 24 May 1895 |
| NLB/11/473 | Copy letter from an unknown correspondent, to Messrs Harrison & Sons | 10 July 1895 |
| NLB/11/514 | Copy letter from Herbert Rix, to William Crookes, Fellow of the Royal Society | 16 July 1895 |
| NLB/11/644 | Copy letter from Theodore E James, to Professor Edwin Ray Lankester, Fellow of the Royal Society | 23 August 1895 |
| NLB/13/139 | Copy letter from Robert William Frederick Harrison, to William Crookes, Fellow of the Royal Society, 7 Kensington Gardens, W. | 20 June 1896 |
| NLB/13/110 | Copy letter from Robert William Frederick Harrison, to William Crookes, Fellow of the Royal Society | 15 June 1896 |
| NLB/13/151 | Copy letter from Michael Foster, to William Crookes, Fellow of the Royal Society, 7 Kensington Park Gardens, W. | 21 June 1896 |
| NLB/13/296 | Copy letter from Robert William Frederick Harrison, to William Crookes, Fellow of the Royal Society | 22 July 1896 |
| NLB/13/373 | Copy letter from Theodore E James, to Richard Tetley Glazebrook, Fellow of the Royal Society, Chairman, Physics and Chemistry Committee | 5 August 1896 |
| NLB/13/308 | Copy letter from Robert William Frederick Harrison, to William Crookes, Fellow of the Royal Society | 23 July 1896 |
| NLB/13/336 | Copy letter from Robert William Frederick Harrison, to Richard Tetley Glazebrook, Fellow of the Royal Society | 28 July 1896 |
| NLB/12/128 | Copy letter from Herbert Rix, to Sir Joseph Lister, President of the Royal Society | 12 December 1895 |
| RR/20/27 | Referee's report by William de Wiveleslie Abney, on a paper 'The preparation of eye-preserving glass for spectacles' by William Crookes | November 1913 |
| NLB/37 | New Letter Book volume 37, copy letters sent from Royal Society administration | 10 January 1908-1 June 1908 |
| RR/15/197 | Referee's report by William Crookes, on a paper 'Notes on quantitative spectra of beryllium' by Walter Noel Hartley | 12 November 1901 |
| NLB/50 | New Letter Book volume 50, copy letters sent from Royal Society administration | 6 April 1914-17 November 1914 |
| NLB/14/397 | Copy letter from Arthur William Rucker, to Joseph Norman Lockyer | 4 March 1897 |
| RR/9/404 | Referee's report by William Crookes, on a paper 'The coefficient of viscosity of air' by Herbert Tomlinson | 10 March 1886 |
| RR/16/6 | Referee's report by William Crookes, on a paper 'The spectra of Neon Krypton and Xenon' by Edward Charles Cyril Baly | 27 June 1903 |
| RR/16/78 | Referee's report by William Crookes, on a paper 'The structure of Gold leaf, and the absorption spectrum of Gold' by John William Mallet | 27 June 1903 |
| NLB/52/413 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Professor I. Gollanoz, Secretary of the British Academy | 1 December 1915 |
| RR/17/144 | Referee's report by William Crookes, on a paper 'A method of depositing copper upon glass from aqueous solutions in a thin brilliantly reflecting film, and thus producing a copper mirror' by Frederick Daniel Chattaway | [November 1907] |
| RR/16/160 | Referee's report by Hugh Frank Newall, on a paper 'On the Ultra violet spectrum of Gadolinium' by William Crookes | 29 December 1904 |
| NLB/22/386 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, [Fellow of the Royal Society] | 4 May 1901 |
| NLB/16/544 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, Fellow of the Royal Society | 27 April 1898 |
| NLB/17/430 | Copy letter from Robert William Frederick Harrison, to Professor W Carleton Williams, University College, Sheffield | 29 October 1898 |
| NLB/37/708 | Copy letter from Robert William Frederick Harrison to Sir William Crookes | 4 May 1908 |
| NLB/18/761 | Copy letter from Arthur William Rucker, to Sir William Crookes, Fellow of the Royal Society | 9 May 1899 |
| NLB/20/545 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, Fellow of the Royal Society | 18 May 1900 |
| NLB/30/236 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, Fellow of the Royal Society | 18 February 1905 |
| NLB/46/737 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, Foreign Secretary of the Royal Society | 26 October 1912 |
| NLB/23/2/547 | Copy letter from Joseph Larmor, to Sir William Crookes, Fellow of the Royal Society | 3 November 1904 |
| NLB/26/838 | Copy letter from Robert William Frederick Harrison to, Sir William Crookes, Fellow of the Royal Society, Chairman of the Soiree Committee | 10 June 1903 |
| NLB/26/99 | Copy letter from Joseph Larmor to, Sir William Crookes, Fellow of the Royal Society | 27 January 1903 |
| NLB/40/274 | Copy letter from Robert William Frederick Harrison to Sir William Crookes, For Sec RS | 17 May 1909 |
| NLB/26/391 | Copy letter from Robert William Frederick Harrison to, Sir William Crookes, Fellow of the Royal Society, 7 Kensington Park Gardens, W. | 11 March 1903 |
| NLB/27/517 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, Fellow of the Royal Society | 14 October 1903 |
| NLB/26/211 | Copy letter from Robert William Frederick Harrison to, Sir William Crookes, Fellow of the Royal Society | 11 February 1903 |
| NLB/27/417 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, Fellow of the Royal Society, 7 Kensington Park Gardens, W. | 19 September 1903 |
| NLB/27/201 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, Fellow of the Royal Society | 20 July 1903 |
| NLB/27/177 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, Fellow of the Royal Society | 15 July 1903 |
| NLB/31/632 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, Fellow of the Royal Society | 23 October 1905 |
| NLB/34/77 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, Fellow of the Royal Society | 23 November 1906 |
| NLB/26/643 | Copy letter from Robert William Frederick Harrison to, Sir William Crookes, Fellow of the Royal Society | 5 May 1903 |
| NLB/26/716 | Copy letter from Robert William Frederick Harrison to, Sir William Crookes, Fellow of the Royal Society | 19 May 1903 |
| NLB/30/214 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, Fellow of the Royal Society | 14 February 1905 |
| NLB/27/463 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, Fellow of the Royal Society | 1 October 1903 |
| NLB/27/820 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, Fellow of the Royal Society | 7 December 1903 |
| NLB/27/723 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, Fellow of the Royal Society | 20 November 1903 |
| NLB/27/683 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, Fellow of the Royal Society | 13 November 1903 |
| NLB/30/834 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, Fellow of the Royal Society | 29 May 1905 |
| NLB/38/270 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, Fellow of the Royal Society | 8 July 1908 |
| NLB/30/151 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, Fellow of the Royal Society | 3 February 1905 |
| NLB/30/758 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, Fellow of the Royal Society | 19 May 1905 |
| NLB/28/324 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, Fellow of the Royal Society | 18 February 1904 |
| NLB/30/565 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, Fellow of the Royal Society | 12 April 1905 |
| NLB/30/380 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, Fellow of the Royal Society | 15 March 1905 |
| NLB/30/386 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, Fellow of the Royal Society | 15 March 1905 |
| NLB/37/813 | Copy letter from Robert William Frederick Harrison to Sir William Crookes FRS | 19 May 1908 |
| NLB/28/486 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, Fellow of the Royal Society | 14 March 1904 |
| NLB/29/783 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, Fellow of the Royal Society | 10 December 1904 |
| NLB/30/685 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, Fellow of the Royal Society | 8 May 1905 |
| NLB/30/659 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, Fellow of the Royal Society | 3 May 1905 |
| NLB/33/5 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, Fellow of the Royal Society | 13 June 1906 |
| NLB/30/860 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, Fellow of the Royal Society | 1 June 1905 |
| NLB/29/466 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, Fellow of the Royal Society | 20 October 1904 |
| NLB/35/19 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, Fellow of the Royal Society | 3 April 1906 |
| NLB/30/833 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, Fellow of the Royal Society | 29 May 1905 |
| NLB/29/745 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, Fellow of the Royal Society | 5 December 1904 |
| NLB/32/268 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, Fellow of the Royal Society | 10 February 1906 |
| NLB/31/69 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, Fellow of the Royal Society | 16 June 1905 |
| NLB/31/597 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, Fellow of the Royal Society | 16 October 1905 |
| NLB/32/308 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, Fellow of the Royal Society | 17 February 1906 |
| NLB/37/232 | Copy letter from Robert William Frederick Harrison to Sir William Crookes FRS | 18 February 1908 |
| NLB/33/685 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, Fellow of the Royal Society | 30 October 1906 |
| NLB/33/844 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, Fellow of the Royal Society | 12 November 1906 |
| NLB/34/41 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, Fellow of the Royal Society | 20 November 1906 |
| NLB/35/124 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, Fellow of the Royal Society | 18 April 1907 |
| NLB/40/788 | Copy letter from Robert William Frederick Harrison to Sir William Crookes, For Sec RS | 20 August 1909 |
| NLB/38/804 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, Fellow of the Royal Society | 9 November 1908 |
| NLB/34/599 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, Fellow of the Royal Society | 13 February 1907 |
| NLB/38/6 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, Fellow of the Royal Society | 2 June 1908 |
| NLB/37/500 | Copy letter from Robert William Frederick Harrison to Sir William Crookes, Fellow of the Royal Society | 30 March 1908 |
| NLB/36/367 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, Fellow of the Royal Society | 18 October 1907 |
| NLB/36/526 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, Fellow of the Royal Society | 11 November 1907 |
| NLB/36/540 | Copy letter from Robert William Frederick Harrison, to Professor Arthur Schuster, Fellow of the Royal Society | 12 November 1907 |
| NLB/38/17 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, Fellow of the Royal Society | 2 June 1908 |
| NLB/37/376 | Copy letter from Robert William Frederick Harrison to Sir William Crookes, Fellow of the Royal Society | 11 March 1908 |
| NLB/38/56 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, Fellow of the Royal Society | 10 June 1908 |
| NLB/41/449 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, Foriegn Secretary of the Royal Society | 16 December 1909 |
| NLB/37/641 | Copy letter from Robert William Frederick Harrison to Sir William Crookes, Fellow of the Royal Society | 23 April 1908 |
| NLB/37/719 | Copy letter from Robert William Frederick Harrison to Sir William Crookes, Fellow of the Royal Society | 5 May 1908 |
| NLB/37/861 | Copy Letter from Archibald Geikie to Sir William Crookes, Fellow of the Royal Society | 26 May 1908 |
| NLB/37/576 | Copy letter from Robert William Frederick Harrison to Sir William Crookes, Fellow of the Royal Society | 8 April 1908 |
| NLB/37/643 | Copy letter from Robert William Frederick Harrison to Sir William Crookes, Fellow of the Royal Society | 24 April 1908 |
| NLB/37/640 | Copy letter from Robert William Frederick Harrison to Professor J Larmor, Fellow of the Royal Society, Secretary of the Royal Society | 23 April 1908 |
| NLB/37/689 | Copy letter from Robert William Frederick Harrison to Professor W [William] M [Mitchinson] Hicks, Fellow of the Royal Society, Chairman of the Physics & Chemistry Sectional Committee | 1 May 1908 |
| NLB/38/156 | Copy letter from Robert William Frederick Harrison, to Dr Hugh Kerr Anderson, Fellow of the Royal Society, and others | 20 June 1908 |
| NLB/37/877 | Copy Letter from Robert William Frederick Harrison to Sir William Crookes, Fellow of the Royal Society | 28 May 1908 |
| NLB/39/497 | Copy letter from The Robert William Frederick Harrison to The Editor, The Times, Printing House Square, EC | 25 January 1909 |
| NLB/39/701 | Copy letter from William Crookes to The President, The Naturalists Students Association, Charkoff | 23 February 1909 |
| NLB/38/639 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, Fellow of the Royal Society | 15 October 1908 |
| NLB/39/767 | Copy letter from Robert William Frederick Harrison to Sir William Crookes, Foreign Sec | 9 March 1909 |
| NLB/38/577 | Copy letter from Robert William Frederick Harrison, to [Sir William Crookes, Fellow of the Royal Society] | 30 September 1908 |
| NLB/38/732 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, Fellow of the Royal Society | 28 October 1908 |
| NLB/39/260 | Copy letter from Robert William Frederick Harrison to Sir W [William] Crookes, Foreign Secretary of the Royal Society | 16 December 1908 |
| NLB/40/255 | Copy letter from Robert William Frederick Harrison to Colonel D [David] Prain FRS | 10 May 1909 |
| NLB/40/327 | Copy letter from Robert William Frederick Harrison to Sir William Crookes, For Sec RS | 24 May 1909 |
| NLB/40/408 | Copy letter from Robert William Frederick Harrison to Professor Larmor, Sec RS | 3 June 1909 |
| NLB/40/780 | Copy letter from Robert William Frederick Harrison to Dr G [George] J James] Burch FRS | 18 August 1909 |
| NLB/41/490 | Copy letter from William Crookes, to Professor Angelo Menozzi, Via Marsala 8, Milan | 21 December 1909 |
| NLB/41/9 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, Foreign Secretary of the Royal Society | 21 September 1909 |
| NLB/41/193 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, Foreign Secretary of the Royal Society | 29 October 1909 |
| NLB/41/175 | Copy letter from Sir William Crookes, to Il Presidente, R Accademia dei Lincei, Rome | 28 October 1909 |
| NLB/43/71 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, Foreign Secretary of the Royal Society | 2 November 1910 |
| NLB/41/806 | Copy letter from Sir William Crookes, to The Rector, the University of Berlin | 28 February 1910 |
| NLB/42/439 | Copy letter from Robert William Frederick Harrison to Sir William Crookes, For Sec RS | 14 June 1910 |
| NLB/42/321 | Copy letter from Robert William Frederick Harrison to Sir William Crookes, For Sec RS | 19 May 1910 |
| NLB/42/409 | Copy letter from Robert William Frederick Harrison to Sir William Crookes, For Sec RS | 8 June 1910 |
| NLB/42/391 | Copy letter from Joseph Larmor, Sec RS to the Right Honourable, The Secretary of State for the Home Department | 3 June 1910 |
| NLB/44/699 | Copy letter from Robert William Frederick Harrison to Sir William Crookes, OM, For Sec RS | 26 October 1911 |
| NLB/42/472 | Copy letter from William Crookes, Foreign Secretary RS to M Serge d'Oldenburg, Secretaire Perpetuel, Membre de l'Academie Imperiale des Sciences, St Petersburg | 16 June 1910 |
| NLB/43/12 | Copy letter from Joseph Larmor, to Sir William Crookes, Foreign Secretary of the Royal Society | 22 October 1910 |
| NLB/44/29 | Copy letter from Robert William Frederick Harrison to Sir W [William] Crookes OM, For Sec RS | 26 April 1911 |
| MC/26/200 | Letter from [William Jackson] Pope, Holmesdale, Brooklands Avenue, Cambridge, to Dr [Alfred Bray] Kempe, Treasurer, The Royal Society | 21 March 1911 |
| NLB/43/606 | Copy letter from William Crookes, to Dr Waldemar Christofer Brogger, Foreign Member of the Royal Society, Royal Frederic University, Christiana | 21 February 1911 |
| NLB/45/251 | Copy letter from Robert William Frederick Harrison to Sir W [William] Crookes OM, For Sec RS | 26 January 1912 |
| NLB/46/231 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, Foreign Secretary of the Royal Society | 26 June 1912 |
| NLB/50/247 | Copy letter from William Crookes, to Major J E Baillie Martin | 28 May 1914 |
| CD/10/1 | Letter from Carmichael Thomas, The Graphic, Tallis Street, Embankment; to Sir William Crookes | 15 June 1909 |
| NLB/46/744 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, Foreign Secretary of the Royal Society | 28 October 1912 |
| NLB/46/743 | Copy letter from Sir William Crookes, to Dr Ladislas Thot, Ujpest, near Budapest, Hungary | 28 October 1912 |
| NLB/50/24 | Copy letter from [William Crookes], to Major Hon W G S Cadogan | 8 April 1914 |
| NLB/50/578 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, President of the Royal Society | 8 August 1914 |
| NLB/50/375 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, President of the Royal Society | 26 June 1914 |
| NLB/50/246 | Copy letter from William Crookes, to Maj Hon W G S Cadogan | 28 May 1914 |
| NLB/50/23 | Copy letter from [William Crookes], to Captain Eric H Bonham | 8 April 1914 |
| NLB/50/244 | Copy letter from William Crookes, to V S Corkran | 28 May 1914 |
| NLB/50/332 | Copy letter from Robert William Frederick Harrison, to [Sir William Crookes], President of the Royal Society | 20 June 1914 |
| NLB/50/552 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, President of the Royal Society | 29 July 1914 |
| NLB/51/126 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society to Sir William Crookes OM, FRS, the Sorby Research Fund Committee | 15 December 1914 |
| NLB/51/123 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society to Sir William Crookes OM, FRS | 14 December 1914 |
| NLB/50/788 | Copy letter from William Crookes, to Lieutenant Colonel Sir David Prain, Fellow of the Royal Society | 6 November 1914 |
| NLB/50/503 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, President of the Royal Society | 21 July 1914 |
| NLB/50/563 | Copy letter from William Crookes, to The Honorable [Herbert Henry] Asquith | 29 July 1914 |
| NLB/50/665 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, President of the Royal Society | 7 October 1914 |
| NLB/52/201 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Sir William Crookes, President of the Royal Society | 13 October 1915 |
| NLB/50/732 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, President of the Royal Society | 26 October 1914 |
| NLB/52/203 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Sir William Crookes, President of the Royal Society | 13 October 1915 |
| NLB/51/564 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society to Sir William Crookes OM, PRS | 27 April 1915 |
| NLB/51/774 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society to Sir William Crookes OM, President of the Royal Society | 26 June 1915 |
| NLB/51/628 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society to Sir William Crookes OM, PRS | 10 May 1915 |
| NLB/56/318 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Sir William Crookes, FRS | 13 January 1919 |
| NLB/52/249 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Dr. Arthur Schuster, Secretary of the Royal Society and FRS | 25 October 1915 |
| RR/17/85 | Referee's report by William Crookes, on two papers 'The evolution of nitric oxide in the decomposition of guncotton' and 'The estimation of small quantities of nitric peroxide' by R Robertson and S Napper | 19 July 1906 |
| RR/18/24 | Referee's report by Edwin Stephen Goodrich, on a paper 'On scandium - Part II' by William Crookes | May 1910 |
| NLB/54/4 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Colonel C. E. Cassal; Public Analysis Department, Town Hall, Kensington, W. | 12 January 1917 |
| MS/929/1/38 | Letter from William Crookes, FRS, to James Mackenzie Davidson | 1906 |
| RR/20/79 | Referee's report by William Crookes, on a paper 'The sublimation of metals at low pressures' by George William Clarkson Kaye and Ewen | 18 June 1913 |
| RR/20/28 | Referee's report by Walter Rosenhain, on a paper 'The preparation of eye-preserving glass for spectacles' by William Crookes | November 1913 |
| MS/929/1/46 | Letter from William Crookes, FRS, to James Mackenzie Davidson | 24 June 1918 |
| RR/6/90 | Referee's report by Charles Wheatstone, on a paper 'On the principle of the photometer' by William Crookes | 6 February 1869 |
| MS/929/1/41 | Letter from William Crookes, FRS, to James Mackenzie Davidson | 11 October 1913 |
| NLB/53/203 | Copy letter from [Joseph John] Thomson, President of the Royal Society and FRS; to Sir William Crookes, O.M., FRS | 25 May 1916 |
| NLB/56/348 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Sir William Crookes, FRS | 17 January 1919 |
| RR/7/163 | Letter from William Crookes, on his paper 'Researches on the atomic weight of thallium' to the Secretary of the Royal Society | 17 November 1872 |
| MS/929/1/45 | Letter from William Crookes, FRS, to James Mackenzie Davidson | 17 November 1913 |
| NLB/56/692 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to [Messrs Harrison & Sons] | 16 April 1919 |
| RR/7/370 | Referee's report by James Clerk Maxwell, on a paper 'On attraction and repulsion resulting from radiation - Part II' by William Crookes | 1875 |
| RR/7/164 | Letter from William Crookes, on his paper 'Researches on the atomic weight of thallium' to the Secretary of the Royal Society | 26 November 1872 |
| MS/929/1/42 | Letter from William Crookes, FRS, to James Mackenzie Davidson | 14 October 1913 |
| RR/8/151 | Referee's report by George Gabriel Stokes, on the Bakerian Lecture 'On the illumination of lines of molecular pressure, and the trajectory of molecules' by William Crookes | 15 January 1879 |
| RR/8/88 | Referee's report by James Clerk Maxwell, on a paper 'On repulsion resulting from radiation.—Part VI' by William Crookes | 23 October 1878 |
| MS/929/1/40 | Letter from William Crookes, FRS, to James Mackenzie Davidson | 3 October 1913 |
| RR/8/282 | Referee's report by William Thomson, Lord Kelvin, on a paper 'On the viscosity of gases at high exhaustions' by William Crookes | 30 March 1881 |
| MS/929/1/43 | Letter from William Crookes, FRS, to James Mackenzie Davidson | 31 October 1913 |
| MS/929/1/44 | Letter from William Crookes, FRS, to James Mackenzie Davidson | 3 November 1913 |
| RR/9/129 | Referee's report by Henry Enfield Roscoe, on a paper 'On radiant matter spectroscopy. A new method of spectrum analysis' by William Crookes | 26 June 1883 |
| RR/9/130 | Referee's report by Arthur Schuster, on a paper 'On radiant matter spectroscopy. A new method of spectrum analysis' by William Crookes | 1883 |
| RR/9/95 | Referee's report by William Crookes, on a paper 'Action of free molecules on radiant heat, and its conversion thereby into sound' by John Tyndall | 28 February 1882 |
| NLB/57/493 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to unknown correspondent | 18 November 1919 |
| RR/12/270 | Referee's report by William Crookes, on a paper 'A possible explanation of the two-fold spectra of oxygen and nitrogen' by Edward Charles Cyril Baly | 11 March 1895 |
| RR/12/352 | Referee's report by William Crookes, on a paper 'Flame spectra observed at Swedish Bessemer works' by C J Lundström and Walter Noel Hartley | 12 August 1895 |
| RR/13/39 | Referee's report by William Crookes, on a paper 'On the spectrum of cyanogen as produced and modified by spark discharges' by Walter Noel Hartley | 1 August 1896 |
| RR/15/209 | Referee's report by William Crookes, on a paper 'The separation of the least volatile gases of atmospheric air, and their spectra' by George Downing Liveing and James Dewar | 5 July 1901 |
| RR/6/87 | Referee's report by George Gabriel Stokes, on a paper 'On the measurement of the luminous intensity of light' by William Crookes | nd [1869] |
| RR/10/249 | Referee's report by William Crookes, on a paper 'Researches in the chemistry of selenic acid and other selenium compounds' by Charles A Cameron and John Macallan | 14 May 1889 |
| RR/17/264 | Referee's report by Thomas Edward Thorpe, on a paper 'On Scandium' by William Crookes | 17 April 1908 |
| RR/18/142 | Referee's report by William Crookes, on a paper 'On some mineral constituents of a dusty atmosphere' by Walter Noel Hartley | 27 November 1911 |
| RR/17/257 | Referee's report by William Crookes, on a paper 'Preliminary note on certain phenomen of the electric discharge through rarified nitrogen' by George James Burch | January 1908 |
| RR/13/281 | Referee's report by William Crookes, on a paper 'Cathode rays and some analogous rays' by Silvanus Phillips Thompson | 3 July 1897 |
| RR/17/276 | Referee's report by William Crookes, on a paper 'The atomic weight of chlorine' by Edward C Edgar | 8 July 1908 |
| NLB/57/154 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Messrs. Spink & Son | 31 July 1919 |
| NLB/57/95 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Mrs Cowland; 17 Arundel Gardens, W | 18 July 1919 |
| RR/23/17 | Referee's report by Alfred Fowler, on a paper 'On the photographic spectra of meteorites' by William Crookes | November 1916 |
| NLB/55/589 | Copy letter from [Joseph John] Thomson, President of the Royal Society; to Sir William Crookes, FRS | 21 June 1918 |
| NLB/55/707 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Sir William Crookes, O.M., FRS | 29 July 1918 |
| NLB/55/713 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Sir William Crookes, O.M., FRS | 01 August 1918 |
| NLB/62/462 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to the Assistant Secretary of the British Association | 17 February 1922 |
| RR/8/89 | Referee's report by James Clerk Maxwell, on the Bakerian Lecture 'On the illumination of lines of molecular pressure, and the trajectory of molecules' by William Crookes | nd [1878] |
| RR/17/265 | Referee's report by Joseph Larmor, on a paper 'On scandium' by William Crookes | 30 April 1908 |
| RR/9/258 | Referee's report by George Downing Liveing, on a paper 'On radiant matter spectroscopy.—Part II. Samarium' by William Crookes | 27 July 1885 |
| MS/373/1/7 | Letter from William Crookes, 20 Mornington Road, London, to [Thomas Edward] Thorpe | 11 July 1877 |
| RR/8/87 | Referee's report by James Clerk Maxwell, on the Bakerian Lecture 'On repulsion resulting from radiation. –Part V' by William Crookes | 23 January 1878 |
| RR/14/229 | Referee's report by William Crookes, on a paper 'On the constitution of the electric spark' by Arthur Schuster and Gustav Hemsalech | 13 February 1899 |
| MOB/066 | Radiometers by William Crookes | c.1875 |
| MOB/067 | Otheoscope by William Crookes | c.1875 |
| MS/373/1/60 | Letter from William Crookes, 7 Kensington Park Gardens, London, to [Thomas Edward] Thorpe | 15 April 1916 |
| CMB/10/8 | Minutes, meeting of the Glassworkers' Cataract Committee | 5 May 1909 |
| IM/005599 | Swinton, Alan Archibald Campbell | 1896 |
| NLB/5/270 | Copy letter from Herbert Rix, to Messrs Drake & Gorham | 24 April 1891 |
| NLB/13/398 | Copy letter from Theodore E James, to Lord Rayleigh [John William Strutt], Sir Joseph Fayrer, Dr William Huggins, William Crookes | 18 August 1896 |
| NLB/9/334 | Copy letter from Herbert Rix, to William Crookes, Fellow of the Royal Society | 30 April 1894 |
| NLB/14/430 | Copy letter from Arthur William Rucker, to Professor [James] Dewar, [Fellow of the Royal Society] | 10 March 1897 |
| RR/17/84 | Referee's report by William Crookes, on a paper 'Constants of explosion of cordite and of modified cordite' by Robert Robertson | 24 March 1906 |
| NLB/28/77 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, Fellow of the Royal Society | 5 January 1904 |
| NLB/27/805 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, Fellow of the Royal Society | 2 December 1903 |
| NLB/39/600 | Copy letter from Robert William Frederick Harrison to S W [William] Crookes, Foreign Secretary of the Royal Society | 12 February 1909 |
| NLB/42/9 | Copy letter from Robert William Frederick Harrison to Dr H [Hans Friedrich] Gadow FRS | 7 March 1909 |
| NLB/50/268 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, President of the Royal Society | 8 June 1914 |
| NLB/50/479 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, President of the Royal Society | 15 July 1914 |
| NLB/51/521 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society to Sir William Crookes OM, PRS | 16 April 1915 |
| NLB/51/644 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society to Sir William Crookes OM, PRS | 14 May 1915 |
| RR/17/207 | Referee's report by William Crookes, on a paper 'The conversion of diamond into coke in high vacuum by cathode rays' by Charles Algernon Parsons and Alan Archibald Campbell Swinton | 10 January 1908 |
| RR/5/54 | Referee's report by Alexander William Williamson, on a paper 'On thallium' by William Crookes | 16 April 1863 |
| RR/9/259 | Referee's report by George Gabriel Stokes, on a paper 'On radiant matter spectroscopy.—Part II. Samarium' by William Crookes | 26 August 1884 |
| NLB/57/701 | Copy letter from Sir William Bate Hardy, FRS, Secretary of the Royal Society [?]; to Admiral Sir Henry B [Braderwine] Jackson, FRS, GCB | 20 January 1920 |
| MC/6/227 | Letter from William Crookes, 20 Mornington Road, to Professor [George Gabriel] Stokes, [Secretary of the Royal Society] | 24 May 1862 |
| MM/21/66 | Letter from William Crookes to EJ Collings | 13 November 1875 |
| NLB/13/150 | Copy letter from Robert William Frederick Harrison, to Professor Michael Foster, Secretary, Royal Society | 22 June 1896 |
| NLB/28/451 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, Fellow of the Royal Society | 9 March 1904 |
| NLB/50/595 | Copy letter from William Crookes, to The Secretary, H M Treasury | 17 September 1914 |
| NLB/57/644 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Conrad Dressler, Esq | 2 January [1920] |
| NLB/52 | New Letter Book volume 52, copy letters sent from Royal Society administration | 9 July 1915-8 March 1916 |
| NLB/57 | New Letter Book volume 57, copy letters sent from Royal Society administration | 27 June 1919-27 February 1920 |
| NLB/30 | New Letter Book volume 30, copy letters sent from Royal Society administration | 14 January 1905-6 June 1905 |
| VF/07 | Portrait of Sir William Crookes by Sir Leslie Ward | 21 May 1903 |
| RR/7/233 | Referee's report by William Odling, on a paper 'Researches on the atomic weight of thallium' by William Crookes | 15 January 1873 |
| PT/68/8 | Paper, 'On thallium' by William Crookes | [1863] |
| MC/6 | Volume 6 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1859-1863 |
| MC/7/46 | Letter from William Crookes, 20 Mornington Road, to [Walter] White, [Assistant Secretary of the Royal Society] | 6 April 1864 |
| MC/7/150 | Letter from William Crookes, 20 Mornington Road, to W [Walter] White, [Assistant Secretary of the Royal Society] | 2 December 1864 |
| MC/7 | Volume 7 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1864-1866 |
| RR/14/230 | Detailed referee's report by William Crookes, on a paper 'On the constitution of the electric spark' by Arthur Schuster and Gustav Hemsalech | 13 February 1899 |
| MC/9/354 | Letter from William Crookes, 20 Mornington Road, to [George Biddell Airy], President of the Royal Society and to the Council | 30 March 1872 |
| MC/9 | Volume 9 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1870-June 1873 |
| MC/11/20 | Letter from William Crookes, 20 Mornington Road, London, to Walter White, [Assistant Secretary of the Royal Society] | 24 February 1877 |
| MC/11 | Volume 11 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1877-1879 |
| MC/12/45 | Letter from William Crookes, 20 Mornington Road, London, to [Walter] White, [Assistant Secretary of the Royal Society] | 13 May 1880 |
| AP/39/10 | Paper, 'On the photography of the Moon' by William Crookes | 1856 |
| MC/12 | Volume 12 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1880-1883 |
| MC/13/17 | Letter from William Crookes, 7 Kensington Park Gardens, London, to [Walter] White, [Assistant Secretary of the Royal Society] | 16 February 1884 |
| MC/13 | Volume 13 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1884 |
| AP/47/6 | Unpublished paper, 'On the development of certain infusoria' by J Samuelson | 1865 |
| AP/47/6/1 | Unpublished manuscript, 'On the development of certain infusoria' by J Samuelson | 1865 |
| RR/7/369 | Referee's report by William Thomson, Lord Kelvin, on a paper 'On attraction and repulsion resulting from radiation - Part II' by William Crookes | 16 June 1875 |
| RR/15/366 | Referee's report by William Crookes, on a paper 'The spectrum of gamma cygni' by Joseph Norman Lockyer and F E Basendall | 6 January 1903 |
| PP/10/6 | Paper, 'On the crimson line of phosphorescent alumina' by William Crookes | 1886 |
| PP/8/6/1 | Manuscript, 'On radiant matter spectroscopy: Note on the spectra of erbia' by William Crookes | [1885-1886] |
| PP/8/6/2 | Diagram, 'Spectra of erbia' by William Crookes | [1885-1886] |
| PP/8/14 | Paper, 'On radiant matter spectroscopy: Note on the earth Yα' by William Crookes | 1886 |
| PP/8/14/1 | Manuscript, 'On radiant matter spectroscopy: Note on the earth Yα' by William Crookes | 1886 |
| PP/8/14/2 | Diagram, spectrum of Yα by William Crookes | 1886 |
| PP/8/34 | Paper, 'On some new elements in gadolinite and samarskite, detected spectroscopically' by William Crookes | 1886 |
| PP/8/34/1 | Manuscript, 'On some new elements in gadolinite and samarskite, detected spectroscopically' by William Crookes | 1886 |
| PP/8/34/2 | Diagram, 'Scale of wave lengths' by William Crookes | 1886 |
| PP/10/13/1 | Manuscript, 'On radiant matter spectroscopy:—Examination of the residual glow' by William Crookes | 1887 |
| PP/10/6/1 | Manuscript, 'On the crimson line of phosphorescent alumina' by William Crookes | 1886 |
| PP/10/6/3 | Diagram, 'Spectrum of spinel (magnesium aluminate)' by William Crookes | 1886 |
| PP/10/6/2 | Diagram, 'The alumina spectrum' by William Crookes | 1886 |
| PP/10/13/3 | Diagram, 'Electrical phosphoroscope. Commutator. Full size' by William Crookes | 1887 |
| PP/10/13/2 | Diagram, 'Electrical phosphoroscope' by William Crookes | 1887 |
| PP/10/13/4 | Diagram, 'Spark spectrum of yttrium' by William Crookes | 1887 |
| PP/8/6 | Paper, 'On radiant matter spectroscopy: Note on the spectra of erbia' by William Crookes | [1885-1886] |
| PP/10/13 | Paper, 'On radiant matter spectroscopy:—Examination of the residual glow' by William Crookes | 1887 |
| PP/18/5/1 | Printed proof, 'On electrical evaporation' by William Crookes | 1891 |
| PP/18/5 | Paper, 'On electrical evaporation' by William Crookes | 1891 |
| PP/18/5/2 | Diagrams, experimental equipment and observations by William Crookes | 1891 |
| RR/5/53 | Referee's report by George Bowdler Buckton, on a paper 'On thallium' by William Crookes | [1863] |
| RR/7/294 | Referee's report by William Thomson, Lord Kelvin, on a paper 'On the action of heat on gravitating masses' by William Crookes | 18 February 1874 |
| RR/7/295 | Referee's report by John Clerk Maxwell, on a paper 'On the action of heat on gravitating masses' by William Crookes | 24 February 1874 |
| RR/8/152 | Referee's report by George Gabriel Stokes, on a paper 'Contributions to molecular physics in high vacua. Magnetic deflection of molecular trajectory. - Laws of magnetic rotation in high and low vacua. - Phosphorogenic properties of molecular discharge' by William Crookes | 22 April 1879 |
| RR/12/395 | Referee's report by Thomas Edward Thorpe, on four papers 'Argon, a new constituent of the atmosphere' by John William Strutt, 3rd Baron Rayleigh and William Ramsay, 'The liquefaction and solidification of argon' by K Olszewski, 'On the spectra of argon' by William Crookes, 'On the spark spectrum of argon as it appears in the spark spectrum of air' by Walter Noel Hartley, and a letter from George Francis Fitzgerald to John William Strutt, 3rd Baron Rayleigh | 13 February 1895 |
| RR/12/396 | Referee's report by John Henry Poynting, on four papers 'Argon, a new constituent of the atmosphere' by John William Strutt, 3rd Baron Rayleigh and William Ramsay, 'The liquefaction and solidification of argon' by K Olszewski, 'On the spectra of argon' by William Crookes, 'On the spark spectrum of argon as it appears in the spark spectrum of air' by Walter Noel Hartley, and a letter from George Francis Fitzgerald to John William Strutt, Lord Rayleigh | 18 February 1895 |
| MC/14 | Volume 14 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1885-1888 |
| MC/19/223 | Letter from William Crookes, 7 Kensington Park Gardens, London, to [Robert William Frederick] Harrison | 23 October 1904 |
| MC/19/225 | Letter from William Crookes, 7 Kensington Park Gardens, London, to [Robert William Frederick] Harrison | 10 December 1904 |
| MC/19/224 | Letter from William Crookes, 7 Kensington Park Gardens, London, to [Robert William Frederick] Harrison | 5 December 1904 |
| MC/19/226 | Letter from William Crookes, 7 Kensington Park Gardens, London, to [Robert William Frederick] Harrison | 29 December 1904 |
| MC/23/114 | Letter from William Crookes, 7 Kensington Gardens, London, to Mr [Robert] Harrison, [The Royal Society] | 10 November 1908 |
| MC/24/124 | Letter from R Accademia Dei Lincei, Roma, to Guglielmo [William] Crookes, Secretary of Foreign Affairs, Royal Society | 12 July 1909 |
| NLB/41/13 | Copy letter from Robert William Frederick Harrison, to Sir William Crookes, Foreign Secretary of the Royal Society | 22 September 1909 |
| MC/26/62 | Letter from William Crookes, 7 Kensington Park Gardens, London, W, to the President & Council of the Royal Society | 24 June 1911 |
| MC/25/50 | Letter from William Crookes, 7 Kensington Park Gardens, London, W, to Mr [Robert] Harrison, [Royal Society] | 15 May 1910 |
| MC/23 | Volume 23 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1908 |
| MC/26/156 | Letter from P.H Martinoble, Heathwood, Marple, Cheshire, to the [Royal Society] | 17 February 1911 |
| MC/26/199 | Letter from [William Jackson] Pope, Holmesdale, Brooklands Avenue, Cambridge, to Mr [Robert] Harrison, the [Royal Society] | 10 January 1911 |
| MC/21 | Volume 21 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1906 |
| MC/27/249 | Letter from Rudolph Messel, 147 Victoria Street, S.W, to [Robert] Harrison, [Assistant Secretary], [Royal Society] | 5 June 1912 |
| MC/28/109 | Letter from J.W Gordon, 113 Broadhurst Gardens, West Hampstead, N.W, to [Robert] Harrison, the [Royal Society] | 15 November 1913 |
| MC/29/49 | Letter from William Crookes, 7 Kensington Park Gardens, London, W, to Mr [Robert] Harrison, [Royal Society] | 1 March 1914 |
| MC/29/50 | Letter from William Crookes,The Royal Society, Burlington House, London, W, to Mr [Robert] Harrison, [Royal Society] | 12 December 1914 |
| MC/19 | Volume 19 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1904 |
| MC/19/222 | Letter from William Crookes, 7 Kensington Park Gardens, London, to [Robert William Frederick] Harrison | 9 March 1904 |
| MC/30/42 | Letter from William Crokes, Lion Mansion Road, Brighton, to Mr [Robert] Harrison, [Royal Society] | 9 September 1915 |
| NLB/52/200 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Miss J. Montefoire; 98 Grosvenor Road, South West of London | 13 October 1915 |
| MC/30/135 | Letter from Julia Montefiore, Northam, [North] Devon, to [Robert William Frederick] Harrison, [Royal Society] | 30 October 1915 |
| MC/30/216 | Letter from [William Whitehead] Watts, Hillside, Langley Park, Sutton, Surrey, to Sir William [Crookes], [President of the Royal Soicety] | 7 March 1915 |
| MC/30/56 | Letter from Dr [John Ambrose] Fleming, The Pender Electrical Laboratory, University College, Gower Street, London, W.C, to Sir William Crookes, [Royal Society] | 19 June 1915 |
| MC/22/51 | Letter from William Crookes, 7 Kensington Park Gardens, London, to [Robert William Frederick] Harrison | 28 October 1907 |
| MC/33/35 | Letter from William Crookes, 7 Kensington Park Gardens, London, W., to The Secretary, Royal Society, Burlington House | 26 July 1918 |
| MC/33/36 | Letter from William Crookes, 7 Kensington Park Gardens, London, W.11., to the Secretary, Royal Society, Burlington House, Piccadilly, W | 17 August 1918 |
| MC/22 | Volume 22 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1907 |
| HS/23/242 | Draft copy of letter, from Sir John Herschel to William Crookes, dated at Collingwood | 10 October 1858 |
| MC/34/76 | Letter from James H Gardiner, on behalf of Sir William Crookes, 7 Kensington Park Gardens, London, W. 11., to The Secretary, The Royal Society | 25 March 1919 |
| MC/34/77 | Letter from James H Gardiner, on behalf of Sir William Crookes, 7 Kensington Park Gardens, London, W. 11., to The Secretary, The Royal Society | 25 April 1919 |
| MC/36 | Volume 36 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1922 |
| MC/36/23 | Letter from E E Fournier d'Albe, The Hermitage, Portsmouth Road, Kingston upon Thames, to the Secretaries of the Royal Society | 4 December 1922 |
| MC/36/24 | Letter from E E Fournier d'Albe, The Hermitage, Portsmouth Road, Kingston upon Thames, to [Francis Alexander] Towle, Assistant Secretary of the Royal Society | 10 December 1922 |