| RefNo | Title | Date |
| EC/1897/14 | Haswell, William Aitcheson: certificate of election to the Royal Society | |
| IM/001982 | Haswell, William Aitcheson | nd |
| NLB/4/1090 | Copy letter from Michael Foster, to Professor William Aitcheson Haswell, University of Sydney | 17 January 1891 |
| NLB/11/411 | Copy letter from Herbert Rix, to Professor Archibald Liversidge, Fellow of the Royal Society | 24 June 1895 |
| NLB/15/372 | Copy letter from Theodore E James, to Messrs Williams & Norgate, 14 Henrietta Street, Covent Garden, W.C. | 3 September 1897 |
| NLB/15/403 | Copy letter from Robert William Frederick Harrison, to Messrs William and Norgate, 14 Henrietta Street, Covent Garden, W.C. | 22 September 1897 |
| NLB/15/749 | Copy letter Theodore E James, to Messrs Harrison & Sons | 1 December 1897 |
| NLB/15/747 | Copy letter from Robert William Frederick Harrison, to Professor William Aitcheson Haswell, Fellow of the Royal Society | 1 DEcember 1897 |
| NLB/15/431 | Copy letter from Robert William Frederick Harrison, to Messrs Robarts Lubbock & Company, 15 Lombard Street, E.C. | [2 October 1897] |
| NLB/19/341 | Copy letter from Theodore E James, to Messrs Williams, 7 Norgate, Henrietta Street, Covent Garden, W.C. | 14 August 1899 |
| NLB/31/705 | Copy letter from Robert William Frederick Harrison, to [William Aitcheson] Haswell, [Fellow of the Royal Society], University of Sydney | [3 November 1905] |
| NLB/31/718 | Copy letter from Arthur Geikie, to Professor William Aitcheson Haswell, Fellow of the Royal Society, the University, Sydney, New South Wales | 3 November 1905 |
| NLB/57/36 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to unknown correspondence | 7 July 1919 |
| NLB/67/690 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Professor [James Peter] Hill, FRS | 14 February 1925 |
| CD/5/9 | Copy letter from Professor [William Blaxland] Benham, to James Hopwood Jeans, Secretary of the Royal Society | 5 August 1922 |
| MC/15/156 | Letter from William [Aitcheson] Haswell, Honorary and Treasurer of the Sydney Biological Station, University of Sydney, to Professor [Michael] Foster | 17 March 1891 |
| MC/15 | Volume 15 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1889-1892 |
| MC/19/401 | Letter from Letter from [William Aitcheson] Haswell, University, Sydney, to the Assistant Secretary of the Royal Society | 29 October 1904 |
| Mc/19/400 | Letter from [William Aitcheson] Haswell, Mimihau, Woollahra Point, Sydney, to the Treasurer of the Royal Society | 1 September 1904 |
| MC/19 | Volume 19 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1904 |