| RefNo | Title | Date |
| EC/1871/04 | Carruthers, William: certificate of election to the Royal Society | |
| NLB/1/605 | Copy letter from Herbert Rix, to William Carruthers, Fellow of the Royal Society | 4 October 1887 |
| NLB/19/35 | Copy letter from Robert William Frederick Harrison, to William Carruthers, Fellow of the Royal Society | 6 June 1899 |
| NLB/2/639 | Copy letter from Herbert Rix, to Mr William Carruthers, [Fellow of the Royal Society] | 1 October 1888 |
| NLB/2/692 | Copy letter from Herbert Rix, to William Carruthers, Fellow of the Royal Society | 12 October 1888 |
| NLB/2/1000 | Copy letter from Herbert Rix, to Mr William Carruthers, Fellow of the Royal Society | 25 January 1889 |
| NLB/4/668 | Copy letter from Herbert Rix, to William Carruthers, Fellow of the Royal Society | 18 September 1890 |
| NLB/3/531 | Copy letter from Herbert Rix, to [John William Strutt] Lord Rayleigh, [Royal Society] | 4 July 1889 |
| NLB/6/705 | Copy letter from Herbert Rix, to William Carruthers, Fellow of the Royal Society | 29 June 1892 |
| NLB/6/750 | Copy letter from Herbert Rix, to Professor Michael Foster, Shelford | 7 July 1892 |
| NLB/5/894 | Copy letter from Herbert Rix, to William Carruthers, Fellow of the Royal Society | 11 November 1891 |
| NLB/16/753 | Copy letter from Robert William Frederick Harrison, to W Carruthers, Fellow of the Royal Society | 2 June 1898 |
| NLB/13/467 | Copy letter from an unknown correspondent, to Messrs Harrison & Sons | 21 September 1896 |
| NLB/8/991 | Copy letter from Herbert Rix, to William Carruthers, [Fellow of the Royal Society] | 6 February 1894 |
| NLB/23/2/9 | Copy letter from Sir Michael Foster, to William Carruthers, Fellow of the Royal Society | 23 January 1901 |
| NLB/9/317 | Copy letter from Herbert Rix, to William Carruthers, Fellow of the Royal Society | 28 April 1894 |
| NLB/12/457 | Copy letter from Herbert Rix, to Professor Alfred Newton, Fellow of the Royal Society, Magdalene College, Cambridge | 21 February 1896 |
| NLB/16/247 | Copy letter from Robert William Frederick Harrison, to W Carruthers, Fellow of the Royal Society | 1 March 1898 |
| NLB/17/77 | Copy letter from Robert William Frederick Harrison, to William Carruthers, Fellow of the Royal Society | 12 July 1898 |
| NLB/17/337 | Copy letter from Robert William Frederick Harrison, to William Carruthers, Fellow of the Royal Society | 13 october 1898 |
| NLB/19/19 | Copy letter from Robert William Frederick Harrison, to William Carruthers, Fellow of the Royal Society | 2 June 1899 |
| NLB/21/749 | Copy letter from Robert William Frederick Harrison, to William Carruthers, Fellow of the Royal Society | 23 January 1901 |
| NLB/31/660 | Copy letter from Robert William Frederick Harrison, to William Carruthers, Fellow of the Royal Society, 14 Vermont Road, Upper Norwood, S.E. | 28 October 1905 |
| NLB/32/297 | Copy letter from Robert William Frederick Harrison, to Messrs Harrison & Sons, 46 St Martin's Lane, W.C. | 15 February 1906 |
| NLB/40/170 | Copy letter from Robert William Frederick Harrison to W [William] Carruthers FRS | 27 April 1909 |
| NLB/45/214 | Copy letter from Robert William Frederick Harrison to W [William] Carruthers FRS | 19 January 1912 |
| RR/7/146 | Referee's report by William Carruthers, on a paper 'On the organization of the fossil plants of the coal-measures - Part I. Catamites' by William Crawford Williamson | 14 June 1871 |
| RR/7/90 | Referee's report by William Carruthers, on a paper 'On the pre-carboniferous floras of North-Eastern America, with especial reference to that of the Erian (Devonian) Period' by John William Dawson | 18 January 1871 |
| RR/8/75 | Referee's report by William Carruthers, on a paper 'On the organization of the fossil plants of the coal-measures. —Part IX' by William Crawford Williamson | 14 August 1877 |
| RR/7/428 | Referee's report by William Carruthers, on a paper 'On the organization of the fossil plants of the coal-measures. Part VII - Myelopteris, psaronius, and kaloxylon' by William Crawford Williamson | 5 August 1875 |
| RR/9/103 | Referee's report by William Carruthers, on a paper 'On the organization of the fossil plants of the coal-measures. Part XII' by William Crawford Williamson | 16 December 1882 |
| RR/11/103 | Referee's report by William Carruthers, on a paper 'On the organisation of the fossil plants of the coal-measures.—Part XVIII' by William Crawford Williamson | 25 February 1891 |
| RR/10/111 | Referee's report by William Carruthers, on a paper 'On the organisation of the fossil plants of the coal-measures.--Part XV' by William Crawford Williamson | 19 October 1888 |
| RR/11/230 | Referee's report by William Carruthers, on a paper 'Studies in the morphology of spore-producing members.—Equisetineae and Lycopodinae' by Frederick Orpen Bower | 7 October 1893 |
| RR/11/220 | Letter from William Carruthers on a paper 'On the organization of the fossil plants of the coal-measures. Part XIX' by William Crawford Williamson | 30 June 1892 |
| RR/11/221 | Referee's report by William Carruthers on a paper 'On the organization of the fossil plants of the coal-measures. Part XIX' by William Crawford Williamson | 30 June 1892 |
| RR/12/265 | Referee's report by William Carruthers, on a paper 'Further observations on the organization of the fossil plants of the coal- measures. —Part I. Calamites, Calamostachys, and Sphenophyllum' by William Crawford Williamson and Dukinfield Henry Scott | 28 February 1894 |
| RR/9/104 | Referee's report by William Carruthers, on a paper 'On the organization of the fossil plants of the coal-measures. Part XII' by William Crawford Williamson | 16 December 1882 |
| NLB/63/33 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Dr. [Alfred Barton] Rendle, FRS | 16 June 1922 |
| NLB/61/431 | Copy letter from Charles [Scott] Sherrington, President of the Royal Society; to Dr. [William] Carruthers, FRS | 7 July 1921 |
| NLB/67/429 | Copy letter from William Bate Hardy, Secretary of the Royal Society; to Dr [Alfred Barton] Rendle, FRS | 18 December 1924 |
| NLB/64/438 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to the Manager of the National Bank of Scotland; 37 Nicholas Lane, E.C.4. | 12 April 1923 |
| NLB/63/17 | Copy letter from Sir Charles Scott Sherrington, President of the Royal Society; to S.W. Carruthers Esq. | 15 June 1922 |
| RR/8/266 | Second referee's report by William Carruthers, on a paper 'On the organization of the fossil plants of the coal-measures.—Part XI' by William Crawford Williamson | 27 October 1880 |
| NLB/67/677 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Dr [Alfred Barton] Rendle, FRS | 13 February 1925 |
| MS/427/76 | Copy letter from [Thomas Henry] Huxley, Secretary of the Royal Society; to [Willaim] Carruthers, FRS | 6 May 1881 |
| NLB/1/436 | Copy letter from Herbert Rix, to William Carruthers | 20 March 1887 |
| NLB/8/1006 | Copy letter from Herbert Rix, to William Carruthers, Fellow of the Royal Society, Central House, Central Hill, S.E. | 9 February 1894 |
| NLB/21/694 | Copy letter from Robert William Frederick Harrison, to William Carruthers, Fellow of the Royal Society, President of the Royal Microscopical Society | 10 January 1901 |
| NLB/28/127 | Copy letter from Robert William Frederick Harrison, to William Carruthers, Fellow of the Royal Society | 13 January 1904 |
| NLB/28/309 | Copy letter from Robert William Frederick Harrison, to William Carruthers, Fellow of the Royal Society, 22 Chalmers Street, Edinburgh | 16 February 1904 |
| NLB/8/1028 | Copy letter from Herbert Rix, to Dr Henry Woodward, Fellow of the Royal Society | 12 February 1894 |
| RR/10/110 | Referee's report by William Carruthers, on a paper 'On the organisation of the fossil plants of the coal-measures.—Part XIII. Heterangium tiliaeoides (Williamson) and Kaloxylon hookeri' by William Crawford Williamson | 25 October 1887 |
| RR/11/105 | Referee's report by William Carruthers, on a paper 'On the organisation of the fossil plants of the coal-measures.—Part XVIII' by William Crawford Williamson | 1 August 1890 |
| RR/9/418 | Referee's report by William Carruthers, on a paper 'On the organisation of the fossil plants of the coal-measures. Heterangium Tiliœoides (Will.) and Kaloxylon Hookeri' by William Crawford Williamson | 23 February 1887 |
| RR/10/314 | Referee's report by William Carruthers, on a paper 'On the organisation of the fossil plants of the coal-measures.—Part XVI' by William Crawford Williamson | 6 June 1889 |
| MC/10/319 | Letter from Wm [William] Carruthers, British Museum, to W [Walter] White, [Assistant Secretary of the Royal Society] | 16 December 1875 |
| MC/10 | Volume 10 of miscellaneous correspondence regarding business matters, sent to the Royal Society | July 1873-1876 |
| RR/7/501 | Referee's report by William Carruthers, on a paper 'On the organization of the fossil plants of the coal-measures. Part VII - Myelopteris, psaronius, and kaloxylon' by William Crawford Williamson | 23 October 1876 |
| RR/8/265 | Referee's report by William Carruthers, on a paper 'On the organization of the fossil plants of the coal-measures.—Part XI' by William Crawford Williamson | 27 October 1880 |
| MC/15/217 | Letter from [William] Carruthers, British Museum (Natural History), Cromwell Road, London, to the Secretary of the Royal Society | 29 October 1891 |
| MC/15/218 | Letter from [William] Carruthers British Museum (Natural History), Cromwell Road, London, to Professor [Michael] Foster | 29 October 1891 |
| MC/15 | Volume 15 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1889-1892 |