| RefNo | Title | Date |
| M/232 | Volterra, Sir Vito | |
| EC/1910/19 | Volterra, Sir Vito: certificate of election to the Royal Society | |
| MM/22/49 | Letter from Vito Volterra, Rome, to Sir George Darwin | 4 April 1903 |
| MM/22/48 | Letter from Vito Volterra, Via in Lucina 17, Rome, to Sir George Darwin | 17 February 1903 |
| MDA/A/22/10 | Copy letter from [Ronald Winckworth] Assistant Secretary of the Royal Society to Professor Vito Volterra | 15 May 1934 |
| MDA/A/22/12 | Letter from Vito Volterra to [Ronald Winckworth] Honorary Secretary of the Royal Society, Ariccia, Rome | 19 May 1934 |
| NLB/52/755 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Messrs Harrison & Sons | 23 February 1916 |
| NLB/57/326 | Copy letter from Sir Arthur Schuster, Secretary of the Royal Society; to the Secretary, Royal Academy of the Lincei | 16 October 1919 |
| NLB/66/161 | Copy letter from William Bate Hardy, Secretary of the Royal Society; to the Rector, Regia University, Naples [Italy] | 6 March 1924 |
| NLB/66/117 | Copy letter from James Hopwood Jeans, Secretary of the Royal Society; to Professor [Vito] Volterra, Foreign Member of the Royal Society | 25 February 1924 |
| NLB/66/810 | Copy letter from James Hopwood Jeans, Secretary of the Royal Society; to Prof. [Vito] Volterra, Foreign Member of the Royal Society | 15 July 1924 |
| NLB/68/83 | Copy letter from James Hopwood Jeans, Secretary of the Royal Society; to Professor [Vito] Volterra, ForMemRS | 8 May 1925 |
| NLB/68/77 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to the Secretary of the Comistato Celebrazione Centenaria; R. Universita, Pavia, Italy | 8 May 1925 |
| NLB/57 | New Letter Book volume 57, copy letters sent from Royal Society administration | 27 June 1919-27 February 1920 |
| NLB/42/649 | Copy letter from Robert William Frederick Harrison to "Nature" | July 1910 |
| MC/25/263 | Letter from Vito Volterra, Rome, to Sir Archibald Geikie, President of the Royal Society, London | 3 September 1910 |
| MC/34/121 | Letter from [Edwin] Ray Lankester, 44 Oakley Street, Chelsea, London, S.W.3., to Mr [Robert] Harrison, [Royal Society] | 6 September 1919 |
| NLB/57/220 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Sir Ray Lankester, FRS, KCB; 44 Oakley Street, Chelsea, SW 3 | 5 September 1919 |