| RefNo | Title | Date |
| EC/1895/12 | Holden, Sir Henry Capel Lofft: certificate of election to the Royal Society | |
| IM/Maull/002175 | Holden, Sir Henry Capel Lofft | nd |
| NLB/13/549 | Copy letter from Robert William Frederick Harrison, to Messrs Harrison & Sons | 6 October 1896 |
| NLB/30/851 | Copy letter from Robert William Frederick Harrison, to Lieutenant Colonel Henry Capel Lofft Holden, Fellow of the Royal Society | 31 May 1905 |
| NLB/32/542 | Copy letter from Joseph Larmor, to Colonel [Henry Capel Lofft] Holden, [Fellow of the Royal Society] | 29 March 1906 |
| NLB/33/728 | Copy letter from Robert William Frederick Harrison, to Lieutenant-Colonel Henry Capel Lofft Holden, Fellow of the Royal Society | 26 October 1906 |
| NLB/38/392 | Copy letter from Robert William Frederick Harrison, to Colonel Henry Capel Lofft Holden, Fellow of the Royal Society | 28 July 1908 |
| NLB/35/319 | Copy letter from Robert William Frederick Harrison, to Colonel Henry Capel Lofft Holden, Fellow of the Royal Society | 15 May 1907 |
| NLB/36/408 | Copy letter from Robert William Frederick Harrison, to Colonel Henry Capel Lofft Holden, Fellow of the Royal Society | 26 October 1907 |
| NLB/36/752 | Copy letter from Robert William Frederick Harrison, to Lieutenant Colonel Holden, Fellow of the Royal Society | 11 December 1907 |
| NLB/52/537 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Messrs Harrison & Sons | 10 January 1916 |
| MS/928/2/96 | Letter from Henry Capel Lofft Holden, Royal Arsenal, to Charles Vernon Boys | 21 November 1892 |
| NLB/3/272 | Copy letter from Herbert Rix, to Professor Alfred George Greenhill, Fellow of the Royal Society, 3 Staples Inn, W.C. | 26 April 1889 |
| AP/77/4 | Unpublished paper, 'Constants of explosion of cordite and of modified cordite' by Robert Robertson | 21 March 1905 |
| AP/77/4/1 | Unpublished manuscript, 'Constants of explosion of cordite and of modified cordite' by Robert Robertson | 21 March 1905 |
| MC/22/123 | Letter from Henry Capel Lofft Holden, Gifford House, St John's Park, Blackheath, to [Robert William Frederick] Harrison | 27 October 1097 |
| MC/22 | Volume 22 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1907 |
| ACS/1/2/2/209 | Letter from [Alan Archibald Campbell] Swinton, to Brig-General., Sir [Henry Capel Lofft] Holden, K. C. B., F.R. S. | 11 March 1927 |
| ACS/1/2/2/223 | Letter from [Alan Archibald Campbell] Swinton, to [Brigadier] Sir [Henry Capel Lofft] Holden, K. C. B, F. R. S. | 15 March 1927 |