| RefNo | Title | Date |
| IM/004551 | Thomson, John Millar | nd |
| EC/1897/23 | Thomson, John Millar: certificate of election to the Royal Society | |
| NLB/63/228 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Professor [John] Millar Thomson, FRS | 19 July 1922 |
| IM/GA/Russell/94398 | Thomson, John Millar | nd |
| NLB/1/67 | Copy letter from Herbert Rix, to Sir John Millar Thomson | 16 February 1886 |
| NLB/1/489 | Copy letter from Herbert Rix, to Professor John Millar Thomson, Secretary of the Chemical Section [of the Royal Society of Arts] | 5 July 1887 |
| NLB/10/989 | Copy letter from Herbert Rix, to Professor John Millar Thomson, 53 Princes Gardens, Bayswater, W. | 19 March 1895 |
| NLB/17/252 | Copy letter from Robert William Frederick Harrison, to Professor John Millar Thomson, Fellow of the Royal Society | 22 September 1898 |
| NLB/54/62 | Copy letter from [Robert William Frederick Harrison, Assistant Secretary of the Royal Society]; to Messrs Harrison & Sons | 29 January 1917 |
| NLB/18/702 | Copy letter from Arthur William Rucker, to Professor J M Thomson, Fellow of the Royal Society | 26 April 1899 |
| NLB/18/703 | Copy letter from Arthur William Rucker, to [Professor G C] Foster | 26 April 1899 |
| NLB/18/741 | Copy letter from Robert William Frederick Harrison, to Professor John M Thomson, Fellow of the Royal Society, 85 Addison Road, W. | 2 May 1899 |
| NLB/22/167 | Copy letter from Robert William Frederick Harrison, to Professor [James Millar] Thomson, Fellow of the Royal Society | 15 March 1901 |
| NLB/29/340 | Copy letter from Robert William Frederick Harrison, to Professor John Millar Thomson, Fellow of the Royal Society | 26 September 1904 |
| NLB/33/478 | Copy letter from an unknown correspondent, to Professor John Millar Thomson, Fellow of the Royal Society, 9 Campden Hill Gardens, W. | 10 September 1906 |
| NLB/33/596 | Copy letter from Robert William Frederick Harrison, to Professor John Millar Thomson, Fellow of the Royal Society, 9 Campden Hill Gardens, W. | 5 October 1906 |
| NLB/37/645 | Copy letter from Robert William Frederick Harrison to Professor J [John] M [Millar] Thomson, Fellow of the Royal Society | 24 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/45/742 | Copy letter from Robert William Frederick Harrison to Professor J [John] M [Millar] Thomson FRS | 1 May 1912 |
| NLB/58/741 | Copy letter from Edwin Deller, Assistant Secretary of the Royal Society; to Dr. [John Millar] Thomson, Chairman of the Library Committee and FRS | 14 June 1920 |
| NLB/45/747 | Copy letter from Robert William Frederick Harrison to Professor J [John] M [Millar] Thomson FRS | 2 May 1912 |
| NLB/46/736 | Copy letter from Robert William Frederick Harrison, to Professor John Millar Thomson, Fellow of the Royal Society | 26 October 1912 |
| NLB/46/760 | Copy letter from Robert William Frederick Harrison, to Professor [John Millar] Thomson, Fellow of the Royal Society | 30 October 1912 |
| NLB/50/844 | Copy letter from Robert William Frederick Harrison, to Professor [John Millar] Thomson, Fellow of the Royal Society, Chemical Society | 17 November 1914 |
| NLB/60/862 | Copy letter from A. H. White, Assistant Librarian of the Royal Society; to Professor [John Millar] Thomson, Chairman of the Library Committee and FRS | 18 April 1921 |
| NLB/60/57 | Copy letter from Edwin Deller, Assistant Secretary of the Royal Society; to Professor [John Millar] Thomson, Chairman of the Library Committee and FRS | 6 December 1920 |
| NLB/56/82 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Dr. [John] Millar Thomson, Chairman of the Library Committee and FRS | 15 November 1918 |
| NLB/63/626 | Copy letter from John [Millar] Thomson, Chairman of the Library Committee and FRS; to Dr. [Charles] Chree, FRS | 18 November 1922 |
| NLB/58/541 | Copy letter from Edwin Deller, Assistant Secretary of the Royal Society; to Dr. [John Millar] Thomson, Chairman of the Library Committee and FRS | 19 May 1920 |
| NLB/58/92 | Copy letter from Edwin Deller, Assistant Secretary of the Royal Society; to Dr. [John] Millar Thomson, Chairman of the Library Committee and FRS | 12 March 1920 |
| NLB/55/508 | Copy letter from Miss Maud K. Jukes, Assistant Secretary of the Royal Society; to [John] Millar Thomson, FRS | 03 May 1918 |
| NLB/58/619 | Copy letter from Edwin Deller, Assistant Secretary of the Royal Society; to Dr. [John Millar] Thomson, Chairman of the Library Committee and FRS | 31 May 1920 |
| NLB/58/83 | Copy letter from Edwin Deller, Assistant Secretary of the Royal Society; to Dr. [John Millar] Thomson, Chairman of the Library Committee and FRS | 12 March 1920 |
| NLB/58/86 | Copy letter from [Alfred Hastings] White, Assistant Librarian of the Royal Society; to Dr. [John Millar] Thomson, Chairman of the Library Committee and FRS | 12 March 1920 |
| NLB/59/98 | Copy letter from Edwin Deller, Assistant Secretary of the Royal Society; to Professor [John Millar] Thomson, Chairman of the Library Committee and FRS | 16 July 1920 |
| NLB/61/354 | Copy letter from John [Millar] Thomson, Chairman of the Library Committee; to the Secretary of the Bavarian Academy of Sciences; Munich | 23 June 1921 |
| NLB/61/351 | Copy letter from [Alfred Hastings] White, Assistant Librarian of the Royal Society; to Professor [John Millar] Thomson, Chairman of the Library Committee and FRS | 22 June 1921 |
| NLB/55/500 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Professor [John Millar] Thomson, FRS | 01 May 1918 |
| NLB/59/31 | Copy letter from Edwin Deller, Assistant Secretary of the Royal Society; to Professor [John Millar] Thomson, Chairman of the Library Committee and FRS | 12 July 1920 |
| NLB/59/537 | Copy letter from Edwin Deller, Assistant Secretary of the Royal Society; to Professor [John Millar] Thomson, Chairman of the Library Committee and FRS | 15 October 1920 |
| NLB/59/215 | Copy letter from Edwin Deller, Assistant Secretary of the Royal Society; to Professor [John Millar] Thomson, Chairman of the Library Committee and FRS | 27 July 1920 |
| NLB/59/741 | Copy letter from Edwin Deller, Assistant Secretary of the Royal Society; to Professor [John Millar] Thomson, Chairman of the Library Committee and FRS | 8 November 1920 |
| NLB/60/165 | Copy letter from William Bate Hardy, Secretary of the Royal Society; to Professor [John Millar] Thomson, Chairman of the Library Committee and FRS | 16 December 1920 |
| NLB/61/399 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Professor [John Millar] Thomson, Chairman of the Library Committee and FRS | 1 July 1921 |
| NLB/60/374 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Professor [John Millar] Thomson, FRS | 24 January 1921 |
| NLB/67/367 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Professor [John] Millar Thomson, FRS | 9 December 1924 |
| NLB/57/58 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Dr J [John] Millar Thomson, FRS | 11 July 1919 |
| NLB/57/84 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Dr J [John] Miller Thomson, FRS | 16 July 1919 |
| NLB/57/554 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to unknown correspondent | 3 December 1919 |
| NLB/61/232 | Copy letter from [Alfred Hastings] White, Assistant Librarian of the Royal Society; to Professor [John Millar] Thomson, Chairman of the Library Committee and FRS | 3 June 1921 |
| NLB/57/309 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Professor [John Millar] Thomson, FRS | 13 October 1919 |
| NLB/61/511 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Dr. [John Millar] Thomson, Chairman of the Library Committee and FRS | 14 July 1921 |
| NLB/57/566 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Dr J [John] Millar Thomson, FRS | 5 December 1919 |
| NLB/61/366 | Copy letter from John [Millar] Thomson, Chairman of the Library Committee; to the Secretary of the Sachsische Akademie der Wissenschaften; Leipzig | 23 June 1921 |
| NLB/61/357 | Copy letter from John [Millar] Thomson, Chairman of the Library Committee; to the Secretary of the Prussian Academy of Sciences; Berlin | 23 June 1921 |
| NLB/61/369 | Copy letter from John [Millar] Thomson, Chairman of the Library Committee; to the Secretary of the Hungarian Academy of Sciences; Budapest | 23 June 1921 |
| NLB/62/314 | Copy letter from Frederick Alexander Towle, Assistant Secretary of the Royal Society; to Professor [John Millar] Thomson, Chairman of the Library Committee and FRS | 20 January 1922 |
| NLB/64/521 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Professor [John Millar] Thomson, FRS | 30 April 1923 |
| NLB/55/931 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Dr. [John Millar] Thomson, FRS | 29 October 1918 |
| NLB/64/187 | Copy letter from William Bate Hardy, Secretary of the Royal Society; to Dr. [John] Millar Thomson, Chairman of the Library Committee and FRS | 21 February 1923 |
| NLB/57/502 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Dr J [John] Millar Thomson, FRS | 19 November 1919 |
| NLB/57/691 | Copy letter from John M [Millar] Thomson, Chairman of the Library Committee of the Royal Society; to Professor JW [John William] Nicholson, FRS, Chairman of the Sectional Committee of Mathematics | 16 January 1920 |
| NLB/63/376 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Professor [John Millar] Thomson, FRS | 04 October 1922 |
| NLB/63/628 | Copy letter from John [Millar] Thomson, Chairman of the Library Committee and FRS; to Dr. [James Whitbread Lee] Glaisher, FRS | 18 November 1922 |
| NLB/65/684 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Professor [John Millar] Thomson, FRS | 7 December 1923 |
| NLB/65/681 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Sir Israel Gollancz, Secretary of the British Academy | 6 December 1923 |
| NLB/67/82 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Sir Arthur Schuster, Foreign Secretary of the Royal Society | 16 October 1924 |
| NLB/67/88 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Professor [John Millar] Thomson, FRS | 18 October 1924 |
| NLB/66/431 | Copy letter from William Bate Hardy, Secretary of the Royal Society; to Prof. [John] Miller Thomson, Chairman of the Library Committee, FRS | 8 May 1924 |
| NLB/67/888 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Professor [John Millar] Thomson, FRS | 1 April 1925 |
| NLB/69/300 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Prof. [John] Millar Thomson, FRS | 24 February 1926 |
| NLB/68/472 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Professor [John] Millar Thomson, FRS | 15 July 1925 |
| NLB/70/112 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Professor [John] Millar Thomson, FRS | 6 January 1927 |
| NLB/69/273 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Prof. [John Millar] Thomson, FRS | 19 February 1926 |
| NLB/70/342 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Professor [John Millar] Thomson, FRS | 9 March 1927 |
| NLB/69/783 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Dr. [George Clarke] Simpson, C.B.E., FRS | 11 October 1926 |
| NLB/70/644 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Professor [John] Millar Thomson, FRS | 18 June 1927 |
| NLB/61/358 | Copy letter from John [Millar] Thomson, Chairman of the Library Committee; to the Secretary of the Academy of Sciences; Vienna | 23 June 1921 |
| NLB/60/799 | Copy letter from [Alfred Hastings] White, Assistant Librarian of the Royal Society; to Professor [John Millar] Thomson, Chairman of the Library Committee and FRS | 7 April 1921 |
| NLB/62/570 | Copy letter from John [Millar] Thomson, Chairman of the Library Committee; to the Members of the Library Committee | 14 March 1922 |
| NLB/57/653 | Copy letter from AH White, Assistant Librarian of the Royal Society; to Professor JM [John Millar] Thomson, FRS | 7 January 1920 |
| NLB/58 | New Letter Book volume 58, copy letters sent from Royal Society administration | 28 February 1920-9 July 1920 |
| NLB/59 | New Letter Book volume 59, copy letters sent from Royal Society administration | 9 July 1920-2 December 1920 |
| NLB/60 | New Letter Book volume 60, copy letters sent from Royal Society administration | 2 December 1920-26 April 1921 |
| NLB/61 | New Letter Book volume 61, copy letters sent from Royal Society administration | 26 April 1921-11 November 1921 |
| NLB/57 | New Letter Book volume 57, copy letters sent from Royal Society administration | 27 June 1919-27 February 1920 |
| MC/16/112 | Letter from John [Millar] Thomson, Honorary Secretary of the Chemical Society, Burlington House, London, to Professor [Michael] Foster | 25 April 1894 |
| MC/16 | Volume 16 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1893-1896 |