| RefNo | Title | Date |
| EC/1898/10 | Osler, Sir William: certificate of election to the Royal Society | |
| NLB/18/378 | Copy letter from Robert William Frederick Harrison, to the Controller, Money Order Office, General Post Office, E.C. | 2 March 1899 |
| NLB/17/437 | Copy letter from Robert William Frederick Harrison, to Professor William Osler, Fellow of the Royal Society, 1 West Franklin Street, Baltimore | 31 October 1898 |
| NLB/16/596 | Copy letter of a notice from Robert William Frederick Harrison, to [The Times] | 5 May 1898 |
| NLB/32/326 | Copy letter from Robert William Frederick Harrison, to Professor William Osler, Fellow of the Royal Society | 20 February 1906 |
| NLB/29/890 | Copy letter from Robert William Frederick Harrison, to Professor William Osler, Fellow of the Royal Society, University, Oxford | 6 January 1905 |
| NLB/33/437 | Copy letter from Robert William Frederick Harrison, to Professor William Osler, Fellow of the Royal Society, 7 Norham Gardens, Oxford | 30 August 1906 |
| NLB/33/362 | Copy letter from A H White, to Professor William Osler, Fellow of the Royal Society | 15 August 1906 |
| NLB/33/410 | Copy letter from A H White, to Professor William Osler, Fellow of the Royal Society | 27 August 1906 |
| NLB/32/806 | Copy letter from Robert William Frederick Harrison, to Professor William Osler, Fellow of the Royal Society | 28 May 1906 |
| NLB/32/840 | Copy letter from Robert William Frederick Harrison, to Professor William Osler, Fellow of the Royal Society | 1 June 1906 |
| NLB/36/859 | Copy letter from Robert William Frederick Harrison, to Messrs Harrison & Sons | 3 January 1908 |
| NLB/34/498 | Copy letter from Robert William Frederick Harrison, to Professor William Osler, Fellow of the Royal Society | 30 January 1907 |
| NLB/36/801 | Copy letter from Robert William Frederick Harrison, to Professor William Osler, Fellow of the Royal Society | 18 December 1907 |
| NLB/37/82 | Copy letter from Robert William Frederick Harrison to Sir R [Robert] Giffen KCB, FRS | 16 January 1908 |
| NLB/39/513 | Copy letter from Robert William Frederick Harrison to Professor W [William] Osler, Fellow of the Royal Society | 29 January 1909 |
| NLB/39/586 | Copy letter from Robert William Frederick Harrison to Professor W [William] Osler, Fellow of the Royal Society | 10 February 1909 |
| NLB/38/745 | Copy letter from Robert William Frederick Harrison, to Professor William Osler, Fellow of the Royal Society | 29 October 1908 |
| NLB/43/250 | Copy letter from Robert William Frederick Harrison, to Professor William Osler, Fellow of the Royal Society | 29 November 1910 |
| MC/20/259 | Letter from [William] Osler, 7 Norham Gardens, Oxford, to the Royal Society | [28 October 1905] |
| NLB/48/800 | Copy letter from Robert William Frederick Harrison, to Sir William Osler, Fellow of the Royal Society | 15 October 1913 |
| NLB/57/646 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to unknown correspondent | 5 January [1920] |
| NLB/55/644 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Sir William Osler, Bart., FRS | 09 July 1918 |
| NLB/17/20 | Copy letter from Robert William Frederick Harrison, to Professor William Osler, Fellow of the Royal Society | 4 July 1898 |
| NLB/32/290 | Copy letter from Robert William Frederick Harrison, to Professor William Osler, Fellow of the Royal Society | 14 February 1906 |
| NLB/37/307 | Copy letter from Robert William Frederick Harrison to R H Burne, Royal College of Surgeons | 28 February 1908 |
| NLB/57 | New Letter Book volume 57, copy letters sent from Royal Society administration | 27 June 1919-27 February 1920 |
| NLB/37/309 | Copy letter from Robert William Frederick Harrison to Professor W Osler, Fellow of the Royal Society | 28 February 1908 |
| MC/20 | Volume 20 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1905 |