| Reference number | Title | Date |
| EC/1855/14 | Williamson, Alexander William: certificate of election to the Royal Society | |
| MM/17/119 | Letter from Ernest Satow, Tokio, Japan, to AW Williamson, Foreign Secretary, Royal Society | 11 January 1882 |
| MS/373/1/126 | Testimonial by Alexander William Williamson, University College, London | 15 May 1874 |
| MS/743/1/23 | Testimonial by Alexander William Williamson, University College London, on behalf of John Hall Gladstone | 15 July 1857 |
| MS/743/1/96 | Letter from Alexander William Williamson, 15 Primrose Hill Road, to [John Hall] Gladstone | 25 November 1880 |
| NLB/1/32 | Copy letter from Alexander William Williamson, to the German Ambassador | [December 1885] |
| NLB/2/189 | Copy letter from Herbert Rix, to Dr Pole | 18 February 1888 |
| NLB/1/304 | Copy letter from Alexander William Williamson, to the German Ambassador | 7 December 1886 |
| NLB/2/190 | Copy letter from Herbert Rix, to Professor Alexander William Williamson, Fellow of the Royal Society | 18 February 1888 |
| NLB/1/305 | Copy letter from Alexander William Williamson, to the United States Minister | 7 December 1886 |
| NLB/2/982 | Copy letter from Herbert Rix, to Professor Alexander William Williamson, Fellow of the Royal Society | 19 January 1889 |
| NLB/4/768 | Copy letter from Herbert Rix, to Professor Alexander William Williamson, Fellow of the Royal Society | 21 October 1890 |
| NLB/7/508 | Copy letter from Herbert Rix, to Dr Alexander William Williamson, Fellow of the Royal Society | 3 March 1893 |
| NLB/7/457 | Copy letter from Herbert Rix, to the Manager, South Western Railway, Waterloo Station, S.E. | 22 February 1893 |
| NLB/7/507 | Copy letter from Herbert Rix, to the Traffic Superintendent, London & Southwestern Railway, Waterloo Station, S.E. | 3 March 1893 |
| NLB/10/1046 | Copy letter from Herbert Rix, to Professor Alexander William Williamson, Fellow of the Royal Society | 28 March 1895 |
| NLB/12/601 | Copy letter from John Evans, to Messrs Robarts, Lubbock & Company | 20 March 1896 |
| NLB/28/747 | Copy letter from Theodore E James, to Messrs Harrison & Sons | 11 May 1904 |
| RR/3/141 | Referee's report by Alexander William Williamson, on a paper 'Note on a new class of alcohols' by August Wilhelm von Hofmann and Auguste Cahours | 15 July 1857 |
| RR/3/136 | Referee's report by Alexander William Williamson, on a paper 'Researches on the cinchona alkaloids' by William Bird Herapath | 4 July 1858 |
| RR/7/157 | Referee's report by Alexander William Williamson, on a paper 'On putrefaction' by Frederick Crace Calvert | 10 June 1872 |
| RR/4/102 | Referee's report by Alexander William Williamson, on a paper 'On the influence of atmospheric pressure upon some of the phenomena of combustion' by Edward Frankland | 28 July 1861 |
| RR/3/291 | Referee's report by Alexander William Williamson, on a paper 'Researches on silica' by Philip Yorke | 15 June 1857 |
| RR/7/497 | Referee's report by Alexander William Williamson, on a paper 'The optical deportment of the atmosphere in relation to the phenomena of putrefaction and infection' by John Tyndall | 19 May 1876 |
| RR/3/33 | Referee's report by Alexander William Williamson, on a paper 'On the isolation of the radical mercuric methyl' by George Bowdler Buckton | 13 March 1858 |
| RR/7/179 | Referee's report by Alexander William Williamson, on a paper 'On fluoride of silver - Part III' by George Gore | 10 June 1872 |
| RR/7/213 | Referee's report by Alexander William Williamson, on a paper 'On the combined action of heat and pressure upon the paraffins' by Thomas Edward Thorpe and John Young | 2 November 1872 |
| RR/6/175 | Referee's report by Alexander William Williamson, on a paper 'Researches into the chemical constitution of narcotine, and of its products of decomposition.—Part II' by Augustus Matthiessen and George Carey Foster | 15 January 1868 |
| RR/8/21 | Referee's report by Alexander William Williamson, on a paper 'On supersatured saline solutions' by J G Grenfell | 3 November 1877 |
| RR/5/134 | Referee's report by Alexander William Williamson, on a paper 'Investigations of the specific heat of solid and liquid bodies' by Hermann Kopp | 3 November 1864 |
| RR/7/207 | Referee's report by Alexander William Williamson, on a paper 'On the normal paraffins' by Carl Schorlemmer | 27 June 1872 |
| MS/427/37 | Copy letter from [Alexander William] Williamson, Secretaire pour L'Strange [Foreign Secretary of the Royal Society]; to Madame la Marquise d Colbert Chabanais | 21 June 1880 |
| MS/427/3 | Copy letter from [Alexander William] Williamson, Foreign Secretary of the Royal Society; to Madame Barrot | 6 November 1879 |
| RR/5/54 | Referee's report by Alexander William Williamson, on a paper 'On thallium' by William Crookes | 16 April 1863 |
| RR/5/147 | Referee's report by Alexander William Williamson, on a paper 'Researches into the chemical constitution of narcotine, and of its products of decomposition.—Part I' by Augustus Matthiessen and George Carey Foster | 13 June 1863 |
| RR/6/177 | Referee's report by Alexander William Williamson, on two papers 'Researches into the chemical constitution of narcotine, and of its products of decomposition.—Part III' and 'Researches into the chemical constitution of narcotine, and of its products of decomposition.- Part IV' by Augustus Matthiessen and Charles Romley Alder Wright | 8 July 1869 |
| RR/8/337 | Referee's report by William Odling, on a paper 'On the coefficients of expansion of the di-iodide of lead, PbI2, and of an alloy of iodide of lead with iodide of silver, PbI2.AgI' by G F Rodwell and Alexander William Williamson | 15 June 1881 |
| RR/10/77 | Second referee's report by Alexander William Williamson, on a paper 'On evaporation and dissociation. Part V. A study of the thermal properties of methyl-alcohol' by William Ramsay and Sydney Young | 5 May 1887 |
| NLB/32/83 | Copy letter from Robert William Frederick Harrison, to Messrs Harrison & Sons | 22 December 1905 |
| RR/5/84 | Referee's report by Alexander William Williamson, on a paper 'On the molecular mobility of gases' by Thomas Graham | 29 July 1863 |
| RR/5/178 | Referee's report by Alexander William Williamson, on a paper 'On mauve or aniline-purple' by William Henry Perkin | 19 November 1863 |
| MC/10/54 | Letter from Asa Gray, Harvard University, Cambridge, Massachusetts, to Professor A W [Alexander William] Williamson, Foreign Secretary of the Royal Society | 25 December 1873 |
| MC/10/434 | Letter from A M Ron, Toronto, to A W [Alexander William] Williamson, Foreign Secretary of the Royal Society, London, England | 27 July 1876 |
| MC/6 | Volume 6 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1859-1863 |
| MC/6/259 | Letter from C B [Charles Beaumont] Phipps, Buckingham Palace, to Dr [William] Sharpey, [Secretary of the Royal Society] | 12 November 1862 |
| MC/8/19 | Letter from Alexr W [Alexander William] Williamson, University College, to W [Walter] White, [Assistant Secretary of the Royal Society] | 1 March 1867 |
| RR/6/291 | Referee's report by Alexander William Williamson, on two papers 'Research conducted for the medical department of the privy council at the pathological laboratory of St. Thomas's Hospital. First series.—The chemical nature and composition, combinations, and metamorphoses of the colouring-matters of bile' and 'Research conducted for the medical department of the privy council at the pathological laboratory of St. Thomas's Hospital regarding urine' by Johann Ludwig Wilhelm Thudichum | 13 May 1868 |
| MC/11/51 | Draft letter from A W [Alexander William] Williamson, Foreign Secretary of the Royal Society, to the President of the Commission Organisatrice | 19 April 1877 |
| MC/9/524 | Letter from Alexd W [Alexander William] Williamson, University College, London, to [William] Spottiswoode, [Treasurer of the Royal Society] | 22 March 1873 |
| MC/9 | Volume 9 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1870-June 1873 |
| MC/10/63 | Letter from Otto Struve, Pulkowa, to [Alexander William Williamson], Foreign Secretary of the Royal Society | 25 January 1874 |
| MC/10/252 | Letter from C [Carl] Ludwig, Waisenhausstrasse 30, Leipzig, to Professor [Alexander William] Williamson, Foreign Secretary of the Royal Society | 19 April 1875 |
| MC/10/255 | Letter from D K Mason, Consul, Consulate of Siam, 5 Great Winchester Street Buildings, London, to A [Alexander] Williamson, Foreign Secretary of the Royal Society, London | 11 May 1875 |
| MC/10/185 | Letter from D K Mason, Consul for Siam, Consulate of Siam, 5 Great Westminster Street Buildings, London, to A W [Alexander William] Williamson, Foreign Secretary of the Royal Society, London | 29 December 1874 |
| MC/10/240 | Letter from G [Gustav] Kirchhoff, Margarethenstrasse 4, Berlin, to Professor [Alexander William] Williamson, Foreign Secretary of the Royal Society | 19 April 1875 |
| MC/10/243 | Letter from J [Joseph] Van Beneden, Louvain, to A [Alexander] Williamson, [Foreign] Secretary of the Royal Society, London | 23 April 1875 |
| MC/10/443 | Letter from Griffin Wm [William] Tyre [?], Multan, Punjab, India, to Professor A W [Alexander William] Williamson, Foreign Secretary of the Royal Society, Burlington House | 30 August 1876 |
| MC/10 | Volume 10 of miscellaneous correspondence regarding business matters, sent to the Royal Society | July 1873-1876 |
| MC/11/7 | Letter from E H Peabody, Academy of Sciences, 263 Wabash Avenue, Chicago, Illinois, to Professor Alexander Wm [William] Williamson, Foreign Secretary of the Royal Society, London, England | 20 January 1877 |
| MC/11/159 | Letter from Simon Newcomb, Washington, to [Alexander William Williamson], Foreign Secretary of the Royal Society | 22 January 1878 |
| AP/52/9 | Unpublished paper, 'On the chemical activity of nitrates' by Edmund J [James] Mills | 1870 |
| MC/11/204 | Letter from G [Gustav] Kirchhoff, Keithstrasse 9, Berlin, to Professor [Alexander William] Williamson, [Foreign Secretary of the Royal Society] | 26 April 1878 |
| MC/11/165 | Letter from B A [Benjamin Apthorp] Gould, National Observatory, Cordoba, Argentine Republic, to [Alexander William Williamson], Foreign Secretary of the Royal Society, London | 2 February 1878 |
| MC/11/264 | Letter from A de Tets, chargé d'affaires of the Netherlands, London, to [Alexander William] Williamson, Foreign Secretary of the Royal Society | 5 November 1878 |
| RR/4/29 | Referee reports by Alexander William Williamson, on three papers 'On the isolation of the organo-metals, mercuric, stannic, and plumbic ethyls; and observations on some of their derivatives - Second memoir' by George Bowdler Buckton; 'Researches on organo-metallic bodies - Fourth memoir' by Edward Frankland; 'On the atomic weight of graphite' by Benjamin Collins Brodie | 12 July 1859 |
| AP/37/29 | Paper, 'On some new derivatives of chloroform' by A W [Alexander William] Williamson | June 1854 |
| AP/37/30 | Paper, 'On the constitution of coal-tar creosote' by A W [Alexander William] Williamson | June 1854 |
| AP/37/34 | Paper, 'Note on the decomposition of sulphuric acid by pentachloride of phosphorus' by A W [Alexander William] Williamson | 1854 |
| AP/37/31 | Paper, 'On a new phosphite of ethyl [ethyl phosphate]' by A W [Alexander William] Williamson | June 1854 |
| AP/37/32 | Paper, 'Note on nitro-glycerine' by A W [Alexander William] Williamson | 1854 |
| AP/37/33 | Unpublished letter, 'On some new compounds of phenyl' from A W [Alexander William] Williamson to Dr [William] Sharpey | 15 March 1854 |
| AP/39/23 | Unpublished paper, 'The gyroscope. A popular explanation of its movements by means of a verbal formula applicable in general to the popular explanation of the phenomena of combined motions. To which is added, the mathematical theory of the gyroscope deduced from elementary principles' by William Cook | 1857 |
| MC/11 | Volume 11 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1877-1879 |
| MC/12/37 | Letter from Spencer F [Fullerton] Baird, Secretary of the Smithsonian Institution, Washington DC, to Dr Alex W [Alexander William] Williamson, Foreign Secretary of the Royal Society, London | 15 April 1880 |
| MC/12/99 | Letter from Ferd [Ferdinand] von Mueller, Melbourne, to [Alexander William Williamson], Foreign Secretary of the Royal Society | 14 October 1880 |
| RR/4/10 | Referee's report by Alexander William Williamson, on a paper 'On spontaneous evaporation' by Charles Cardale Babington | 23 February 1860 |
| MC/12/355 | Letter from Prof Dr C [Constantin] Le Paige, Royal Society of Sciences, Liège, to Professor Alex [Alexander] William Williamson, [Foreign] Secretary of the Royal Society | 9 October 1883 |
| MC/12 | Volume 12 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1880-1883 |
| MC/13/11 | Letter from [Georg Herbert Münster], German Ambassador, German Embassy, to [Alexander William Williamson], Foreign Secretary of the Royal Society | 11 February 1884 |
| MC/13 | Volume 13 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1884 |
| MC/8 | Volume 8 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1867-1869 |
| AP/58/6 | Unpublished paper, 'Researches upon the specific volumes of liquids. I - On the atomic value of phosphorus' by T E [Thomas Edward] Thorpe | 1875 |
| PP/10/46 | Paper, 'Contributions to our knowledge of antimony pentachloride' by Richard Anschütz and P Norman Evans | 1887 |
| PP/9/18 | Paper, 'On a varying cylindrical lens' by Tempest Anderson | 1886 |
| RR/5/73 | Referee's report by Alexander William Williamson, on two papers, 'On the oxidation and disoxidation effected by the alkaline peroxides' by Benjamin Collins Brodie and 'On the law of expansion of superheated steam' by William Fairbairn | 22 October 1862 |
| RR/5/93 | Referee's report by Alexander William Williamson, on a paper 'On the influence of physical and chemical agents upon blood; with special reference to the mutual action of the blood and the respiratory gases' by George Harley | 14 June 1864 |
| RR/8/179 | Referee's report by Alexander William Williamson, on a paper 'An account of experiments on the influence of colloids upon crystalline form, and on movements observed in mixtures of colloids with crystalloids' by William Miller Ord | 9 July 1879 |
| RR/10/75 | Referee's report by Alexander William Williamson, on a paper 'On evaporation and dissociation. Part V. A study of the thermal properties of methyl-alcohol' by William Ramsay and Sydney Young | 25 March 1887 |
| MC/14/112 | Letter from Frank Wooldridge, HM Consul, Barcelona, to [Alexander William] Williamson, Foreign Secretary of the Royal Society | 5 March 1886 |
| MC/14/227 | Letter from George C Handford, 24 West End Lane, Kilburn, to [Alexander William] Williamson, Secretary of the Royal Society | 15 June 1887 |
| MC/14 | Volume 14 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1885-1888 |
| MC/27/249 | Letter from Rudolph Messel, 147 Victoria Street, S.W, to [Robert] Harrison, [Assistant Secretary], [Royal Society] | 5 June 1912 |