| Reference number | Title | Date |
| EC/1889/14 | Sollas, William Johnson: certificate of election to the Royal Society | |
| IM/Maull/004304 | Sollas, William Johnson | nd |
| IM/Maull/004305 | Sollas, William Johnson | nd |
| NLB/27/47 | Copy letter from Robert William Frederick Harrison, to Professor William Johnson Sollas, Fellow of the Royal Society | 23 June 1903 |
| NLB/27/48 | Copy letter from Robert William Frederick Harrison, to Professor William Johnson Sollas, Fellow of the Royal Society | 23 June 1903 |
| NLB/3/505 | Copy letter from an unknown correspondent, to Harrison & Sons | 27 June 1889 |
| NLB/6/630 | Copy letter from Theodore E James, to Messrs Harrison & Sons | 17 June 1892 |
| NLB/6/1043 | Copy letter from Herbert Rix, to Professor William Johnson Sollas, Fellow of the Royal Society | 8 October 1892 |
| NLB/19/785 | Copy letter from an unknown correspondent, to William Johnson Sollas, Fellow of the Royal Society | [17 December 1899] |
| NLB/12/429 | Copy letter from Michael Foster, to His Excellency Sir John Bates Thurston, Governor of Fiji, Government House, Viti Levu, Fiji | 18 February 1896 |
| NLB/12/518 | Copy letter from Michael Foster, to Sir Saul Samuel, Agent-General for New South Wales, Westminster Chambers, 9 Victoria Street, S.W. | 5 March 1896 |
| NLB/16/755 | Copy letter from Robert William Frederick Harrison, to Professor Sollas, Fellow of the Royal Society | 2 June 1898 |
| NLB/14/319 | Copy letter from Robert William Frederick Harrison, to Professor Thomas George Bonney, Fellow of the Royal Society | 16 February 1897 |
| NLB/14/274 | Copy letter from Robert William Frederick Harrison, to Professor Thomas George Bonney, Fellow of the Royal Society | 8 February 1897 |
| NLB/14/321 | Copy letter from Robert William Frederick Harrison, to Professor William Johnson Sollas, Fellow of the Royal Society | 17 February 1897 |
| RR/22/106 | Referee's report by Arthur Smith Woodward, on a paper 'The skull of ichthyosaurus, studied in serial sections' by William Johnson Sollas | 1916 |
| RR/16/114 | Referee's report by Arthur Smith Woodward, on a paper 'An account of the Devonian fish Palaeospondylus gunni, Traquair' by William Johnson Sollas and Igerna Briinhilda Johnson Sollas | June 1903 |
| RR/16/112 | Referee's report by Thomas George Bonney, on a paper 'A method for the investigation of fossils by serial sections' by William Johnson Sollas | 10 June 1903 |
| RR/16/113 | Referee's report by Richard Lydekker, on a paper 'An account of the Devonian fish Palaeospondylus gunni, Traquair' by William Johnson Sollas and Igerna Briinhilda Johnson Sollas | June 1903 |
| RR/15/257 | Referee's report by Henry Alexander Miers, on a paper 'The intimate structure of crystals, Part V' by William Johnson Sollas | 13 May 1901 |
| RR/18/183 | Referee's report by William Kingdon Spencer, on a paper 'Lapworthura: a typical brittlestar of the Silurian age; with suggestions for a new classification of the Ophiuroidea' by Igerna Sollas and William Johnson Sollas | July 1911 |
| NLB/15/353 | Copy letter from Theodore E James, to Messrs Harrison & Sons | 19 August 1897 |
| NLB/16/107 | Copy letter from Robert William Frederick Harrison, to Professor W J Sollas, Fellow of the Royal Society | 31 January 1898 |
| NLB/17/317 | Copy letter from Robert William Frederick Harrison, to Professor William Johnson Sollas, Fellow of the Royal Society | 7 October 1898 |
| NLB/23/2/88 | Copy letter from Arthur William Rucker, to Professor William Johnson Sollas, Fellow of the Royal Society | 25 June 1901 |
| NLB/16/619 | Copy letter from Michael Foster, to Professor W J Sollas, Fellow of the Royal Society, Oxford | 6 May 1898 |
| NLB/16/216 | Copy letter from an unknown correspondent, to R T Glazebrook, Fellow of the Royal Society | 23 February 1898 |
| NLB/16/239 | Copy letter from Arthur William Rucker, to Professor W J Sollas, Fellow of the Royal Society | 1 March 1898 |
| NLB/15/790 | Copy letter from Michael Foster, to the Secretary to Admiralty, Whitehall, S.W. | 3 December 1897 |
| NLB/17/294 | Copy letter from Robert William Frederick Harrison, to Messrs Robarts, Lubbock & Company | [4 October 1898] |
| NLB/22/348 | Copy telegram from Sir Michael Foster, to Professor [William Johnson] Sollas, [Fellow of the Royal Society], 169 Woodstock Road, Oxford | [April 1901] |
| NLB/22/347 | Copy letter from Robert William Frederick Harrison, to Professor [William Johnson] Sollas, Fellow of the Royal Society | 27 April 1901 |
| NLB/22/379 | Copy letter from Robert William Frederick Harrison, to Professor [William Johnson] Sollas, Fellow of the Royal Society | 3 May 1901 |
| NLB/23/2/410 | Copy letter sent from Joseph Larmor, to Professor William Johnson Sollas, Fellow of the Royal Society, and Ignerna Brünhilda Johnson Sollas | 11 December 1903 |
| NLB/22/509 | Copy letter from [Arthur William] Rucker, to Professor [William Johnson] Sollas, Fellow of the Royal Society | 23 May 1901 |
| NLB/21/512 | Copy letter from Robert William Frederick Harrison, to Professor William Johnson Sollas, Fellow of the Royal Society | 30 November 1900 |
| NLB/22/461 | Copy letter from Robert William Frederick Harrison, to Professor [William Johnson] Sollas, Fellow of the Royal Society | 20 May 1901 |
| NLB/21/593 | Copy letter from Robert William Frederick Harrison, to Professor William Johnson Sollas, Fellow of the Royal Society | 13 December 1900 |
| NLB/23/1/34 | Copy letter from R Champan, to Professor William Johnson Sollas, Fellow of the Royal Society | 20 August 1901 |
| NLB/23/2/408 | Copy letter sent from Joseph Larmor, to William Johnson Sollas, Fellow of the Royal Society | 11 December 1903 |
| NLB/25/820 | Copy letter from Robert William Frederick Harrison, to Professor William Johnson Sollas, [Fellow of the Royal Society], Oxford | 7 January 1903 |
| NLB/28/88 | Copy letter from Robert William Frederick Harrison, to Professor William Johnson Sollas, Fellow of the Royal Society | 6 January 1903 |
| NLB/28/138 | Copy note by Robert William Frederick Harrison on the Coral Report | 15 January 1904 |
| NLB/28/521 | Copy letter from Robert William Frederick Harrison, to Professor William Johnson Sollas, Fellow of the Royal Society | 23 March 1904 |
| NLB/29/421 | Copy letter from Robert William Frederick Harrison, to Professor William Johnson Sollas, Fellow of the Royal Society | 7 October 1904 |
| NLB/28/615 | Copy letter from Robert William Frederick Harrison, to Professor William Johnson Sollas, Fellow of the Royal Society, Oxford | 19 April 1904 |
| NLB/31/825 | Copy letter from Robert William Frederick Harrison, to Professor William Johnson Sollas, Fellow of the Royal Society | 21 November 1905 |
| NLB/31/755 | Copy letter from Robert Frederick William Harrison, to Professor William Johnson Sollas, Fellow of the Royal Society, 173 Woodstock Road, Oxford | 9 November 1905 |
| NLB/34/15 | Copy letter from Robert William Frederick Harrison, to Professor William Johnson Sollas, Fellow of the Royal Society, 173 Woodstock Road, Oxford | 16 November 1906 |
| MC/21/583 | Letter from [William Johnson] Sollas, 173 Woodstock Road, Oxford, to the Royal Society | 21 September 1906 |
| NLB/48/562 | Copy letter from Robert William Frederick Harrison, to Professor [William Johnson] Sollas, Fellow of the Royal Society | 26 July 1913 |
| NLB/36/182 | Copy letter from Robert William Frederick Harrison, to Professor William Johnson Sollas, Fellow of the Royal Society | 4 September 1907 |
| NLB/35/487 | Copy letter from Robert William Frederick Harrison, to Professor Sydney John Hickson, Fellow of the Royal Society, Chairman of the Zoology Sectional Committee | 5 June 1907 |
| NLB/35/486 | Copy letter from Robert William Frederick Harrison, to Professor Sydney John Hickson, Fellow of the Royal Society, Chairman of the Zoology Committee | 4 June 1907 |
| NLB/36/405 | Copy letter from Robert William Frederick Harrison, to Professor William Johnson Sollas, Fellow of the Royal Society | 26 October 1907 |
| NLB/37/67 | Copy letter from Robert William Frederick Harrison to Professor W [William] J [Johnson] Sollas FRS | 20 January 1908 |
| NLB/48/546 | Copy letter from Robert William Frederick Harrison, to Professor [William Johnson] Sollas, Fellow of the Royal Society | 24 July 1913 |
| MC/24/166 | Letter from [William Johnson] Sollas, 173 Woodstock Road, Oxford, to [Robert] Harrison, [Royal Society] | March 1909 |
| NLB/48/106 | Copy letter from Robert William Frederick Harrison, to Professor William Johnson Sollas, Fellow of the Royal Society | 19 May 1913 |
| NLB/44/545 | Copy letter from Robert William Frederick Harrison to Professor W [William] J [Johnson] Sollas FRS | 2 August 1911 |
| NLB/47/582 | Copy letter from Robert William Frederick Harrison to Professor W [William] J [Johnson] Sollas FRS | 26 February 1913 |
| NLB/48/412 | Copy letter from Robert William Frederick Harrison, to [William Johnson] Sollas, Fellow of the Royal Society | 1 July 1913 |
| NLB/48/739 | Copy letter from Robert William Frederick Harrison, to Professor [William Johnson] Sollas, Fellow of the Royal Society | 3 October 1913 |
| NLB/48/802 | Copy letter from Robert William Frederick Harrison, to Professor [William Johnson] Sollas, Fellow of the Royal Society | 15 October 1913 |
| NLB/50/809 | Copy letter from Arthur Schuster, to Professor William Johnson Sollas, Fellow of the Royal Society | 5 November 1914 |
| NLB/52/489 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Professor William Johnson Sollas, FRS | 21 December 1915 |
| NLB/52/635 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to George William Lamplugh Esquire, Chairman of the Geology Committee and FRS | 1 February 1916 |
| NLB/63/103 | Copy letter from William Bate Hardy, Secretary of the Royal Society and FRS; to Professor [William Johnson] Sollas, FRS | 29 June 1922 |
| RR/17/222 | Referee's report by Alfred Cort Haddon, on a paper 'On the cranial and facial characters of the neandertal race' by William Johnson Sollas | [July 1907] |
| RR/20/129 | Referee's report by Edwin Tulley Newton, on a paper 'A study of the skull of a dicynodon by means of serial sections' by Ignera Sollas and William Johnson Sollas | 21 July 1913 |
| NLB/63/139 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Professor [William Johnson] Sollas, FRS | 05 July 1922 |
| NLB/57/490 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Professor WJ [William Johnson] Sollas, FRS | 14 November 1919 |
| NLB/55/53 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Professor [William Johnson] Sollas, FRS | 16 November 1917 |
| NLB/55/206 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Professor [William Johnson] Sollas, FRS | 14 January 1918 |
| RR/22/105 | Referee's report by Charles William Andrews, on a paper 'The skull of ichthyosaurus, studied in serial sections' by William Johnson Sollas | 1916 |
| RR/14/164 | Referee's report by William Johnson Sollas, on a paper 'Polytremacis and the ancestry of Helioporidae' by John Walter Gregory | nd [December 1899] |
| NLB/60/131 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Professor [William Johnson] Sollas, FRS | 13 December 1920 |
| RR/14/95 | Referee's report by George Downing Liveing, on two papers 'On the intimate structure of crystals. Part I. Crystals of the cubic system with cubic cleavage' and 'On the intimate structure of crystals. Part II. Crystals of the cubic system with cubic cleavage. Haloid compounds of silver' by William Johnson Sollas | 28 January 1898 |
| RR/17/349 | Referee's report by Joseph Larmor, on a paper 'The intimate structure of crystals part VI' by William Johnson Sollas | 11 January 1908 |
| NLB/57/30 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Prof. WJ [William Johnson] Sollas, FRS | 4 July 1919 |
| NLB/57/488 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to unknown correspondent | 14 November 1919 |
| RR/57/46 | Referee's report by William Johnson Sollas, on a paper 'The ostracoderm Pteraspis Kner and the relationships of the agnathous vertebrates' by Errol Ivor White | [May 1935] |
| NLB/67/273 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Sir Arthur Woodward, FRS | 26 November 1924 |
| NLB/69/238 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Prof. [William Johnson] Sollas, FRS | 12 February 1926 |
| NLB/14/446 | Copy letter from Michael Foster, to the Trustees of the Australian Museum, Sydney, New South Wales | 11 March 1897 |
| NLB/15/180 | Copy letter from Robert William Frederick Harrison, to the Secretary of the Australian Museum, Sydney, New South Wales | 9 July 1897 |
| NLB/16/195 | Copy letter from Robert William Frederick Harrison, to Professor H A Miers, Fellow of the Royal Society | 19 February 1898 |
| NLB/15/567 | Copy letter from Arthur William Rucker, to the Secretary of the Australian Museum, Sydney | 29 October 1897 |
| NLB/16/395 | Copy letter from Robert William Frederick Harrison, to Professor Michael Foster and Professor Sollas and [Science] and Art Department | 26 March 1898 |
| NLB/22/577 | Copy letter from Robert William Frederick Harrison, to [William Johnson] Sollas, Fellow of the Royal Society | 7 June 1901 |
| NLB/28/701 | Copy letter from Robert William Frederick Harrison, to Professor William Johnson Sollas, Fellow of the Royal Society, 173 Woodstock Road, Oxford | 8 May 1904 |
| NLB/33/716 | Copy letter from Robert William Frederick Harrison, to; Augustus Desire Waller, Lord Avebury [John Lubbock], Sir Benjamin Baker, Dr Henry Frederick Baker, Professor David Ferrier, Professor Sydney John Hickson, Dr A Scott, Mr Albert Charles Seward, Professor William Johnson Sollas, and Professor Silvanus Phillips Thompson, Fellows of the Royal Society | 26 October 1906 |
| NLB/44/772 | Copy letter from Robert William Frederick Harrison to Professor W [William] J [Johnson] Sollas FRS | 6 November 1911 |
| NLB/52/706 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Professor William Johnson Sollas, FRS | 18 February 1916 |
| RR/17/221 | Referee's report by Johnson Symington, on a paper 'On the cranial and facial characters of the neandertal race' by William Johnson Sollas | 21 June 1907 |
| RR/16/111 | Referee's report by John Wesley Judd, on a paper 'A method for the investigation of fossils by serial sections' by William Johnson Sollas | 6 June 1903 |
| RR/14/96 | Referee's report by Henry Alexander Miers, on two papers 'On the intimate structure of crystals. Part I. Crystals of the cubic system with cubic cleavage' and 'On the intimate structure of crystals. Part II. Crystals of the cubic system with cubic cleavage. Haloid compounds of silver' by William Johnson Sollas | 23 February 1898 |
| RR/24/66 | Referee's report by William Johnson Sollas, on a paper 'The transition from rostro-carinate flint implements to the tongue-shaped implements of river-terrace gravels' by James Reid Moir | 28 January 1918 |
| NLB/35/782 | Copy letter from Robert William Frederick Harrison, to Professor Sydney John Hickson, Fellow of the Royal Society | 16 July 1907 |
| RR/18/182 | Referee's report by Francis Arthur Bather, on a paper 'Lapworthura: a typical brittlestar of the Silurian age; with suggestions for a new classification of the Ophiuroidea' by Igerna Sollas and William Johnson Sollas | 24 July 1911 |
| RR/20/128 | Referee's report by Arthur Smith Woodward, on a paper 'A study of the skull of a dicynodon by means of serial sections' by Ignera Sollas and William Johnson Sollas | July 1913 |
| RR/28/16 | Referee's report by Grafton Elliot Smith, on a paper 'A method for the comparative study of the human skull, and its application to Homo sapiens and Homo neandertalensis' by William Johnson Sollas | [June 1922] |
| NLB/15/252 | Copy letter from Michael Foster, to the Secretary, Science and Art Department, South Kensington, S.W. | 24 July 1897 |
| MC/19/769 | Letter from [William Johnson] Sollas, 173 Woodstock Road, Oxford, to [Robert William Frederick] Harrison | 2 April 1904 |
| MC/19/770 | Letter from [William Johnson] Sollas, 173 Woodstock Road, Oxford, to [Robert William Frederick] Harrison | 23 April 1904 |
| MC/17 | Volume 17 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1897-1899 |
| MC/26/117 | Letter from George [Jennings] Hinde, The Royal Society, Burlington House, London, W, to [Robert] Harrison, [Assistant Secretary], [Royal Society] | 17 June 1911 |
| MC/21 | Volume 21 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1906 |
| MC/28/262 | Letter from [William Johnson] Sollas, 173 Woodstock Road, Oxford, to Mr [Robert] Harrison, [Royal Society] | 18 May 1913 |
| MC/28/263 | Letter from [William Johnson] Sollas, 173 Woodstock Road, Oxford, to Mr [Robert] Harrison, [Royal Society] | 27 June 1913 |
| MC/29/207 | Letter from [Henry Frederick] Ponsonby, the Keeper of the Privy Purse, Privy Purse Office, Buckingham Palace, to The Secretary, Royal Society, W | 7 November 1914 |
| MC/19 | Volume 19 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1904 |
| MC/29/249 | Letter from [William Johnson] Sollas, 173 Woodstock Road, Oxford, to Professor Schuster, [Royal Society] | 11 November 1914 |
| MC/29/250 | Letter from [William Johnson] Sollas, 173 Woodstock Road, Oxford, to Professor Arthur Schuster, [Royal Society] | 21 November 1914 |
| NLB/33/524 | Copy letter from Robert William Frederick Harrison, to Professor William Johnson Sollas, Fellow of the Royal Society | 21 September 1906 |
| MC/34/138 | Letter from [Edwin Tulley] Newton, 13 Willow Bridge [Road], Cannonbury, N.1., to Mr [Robert] Harrison, | 16 April 1919 |