| RefNo | Title | Date |
| IM/003458 | Pavlov, Ivan Petrovich | nd |
| EC/1907/19 | Pavlov, Ivan Petrovich: certificate of election to the Royal Society | |
| NLB/52/418 | Copy letter from Sir William Bate Hardy, Vice-President of the Royal Society; to Mr. Aleksandr Konstantinovich Benkendorf, The Russian Ambassador to the United Kingdom; Chesham House, Chesham Place, S.W. | 2 December 1915 |
| NLB/52/333 | Copy letter from Arthur Schuster, Secretary of the Royal Society; to Professor Ivan Petrovitch Pavlov, FRS | 11 November 1915 |
| NLB/35/160 | Copy letter from Robert William Frederick Harrison, to Professor Ernest Henry Starling, Fellow of the Royal Society | 26 April 1907 |
| NLB/52/694 | Copy letter from [Robert William Frederick Harrison, Assistant Secretary of the Royal Society]; to Messrs Harrison & Sons | 14 February 1916 |
| NLB/52/743 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to W. H. Thompson Esquire; 14 Hatch Street, Dublin | 22 February 1916 |
| NLB/52/422 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to The First Secretary of the Imperial Russian Embassy | 6 December 1915 |
| NLB/52/484 | Copy letter from [Robert William Frederick Harrison, Assistant Secretary of the Royal Society]; to Mr. Aleksandr Konstantinovich Benkendorf, The Russian Ambassador to the United Kingdom; Chesham House, Chesham Place, S.W. | 17 December 1915 |
| NLB/52/669 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Professor Ivan Petrovich Pavlov, FRS | 9 February 1916 |
| NLB/52/725 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Professor Frederick Gowland Hopkins, FRS | 19 February 1916 |
| NLB/52/394 | Copy letter from Sir William Crookes, President of the Royal Society; to Mr. Aleksandr Konstantinovich Benkendorf, The Russian Ambassador to the United Kingdom | 26 November 1915 |
| NLB/58/564 | Copy letter from Edwin Deller, Assistant Secretary of the Royal Society; to Professor [William Maddock] Bayliss, FRS | 21 May 1920 |
| NLB/69/528 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Prof. [Ernest Henry] Starling, FRS | 31 May 1926 |
| NLB/71/445 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Prof. [Ivan Petrovich] Pavlov, Foreign Member of the Royal Society | 22 May 1928 |
| NLB/52/329 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to The Deputy Master of the [Royal] Mint | 11 November 1915 |
| MDA/C/4/2 | Letters on nominations to deliver the Croonian Lecture | 1921-1925 |