| Reference number | Title | Date |
| IM/Maull/000743 | Carter, Henry John | nd |
| MM/17/77 | Letter from Rev HJ Carter to Herbert Rix, Assistant Secretary, Royal Society | 30 July 1895 |
| MS/787/1/19 | Letter from Henry J[ohn] Carter, The Cottage, Budleigh Salterton, Devon, to H[enry] B[owman] Brady | 24 September 1877 |
| MS/787/1/54 | Letter from Henry J[ohn] Carter, the Cottage, Budleigh Salterton, Devon, to H[enry] B[owman] Brady | 22 November 1888 |
| NLB/4/509 | Copy letter from Herbert Rix, to Henry Carter, Fellow of the Royal Society | 21 June 1890 |
| NLB/3/496 | Copy letter from Herbert Rix, to Henry John Carter, Fellow of the Royal Society | 25 June 1889 |
| NLB/3/542 | Copy letter from Herbert Rix, to Henry John Carter, Fellow of the Royal Society | 8 July 1889 |
| NLB/3/503 | Copy letter from Herbert Rix, to Dr Henry John Carter, Fellow of the Royal Society | 27 June 1889 |
| NLB/3/668 | Copy letter from Theodore E James, to Henry John Carter, Fellow of the Royal Society | 17 August 1889 |
| NLB/11/161 | Copy letter from an unknown correspondent, to Messrs Harrison & Sons | 7 May 1895 |
| RR/7/225 | Referee's report by John Scott Burdon-Sanderson, on a paper 'Structural elements of urinary calculi' by Henry John Carter | 1873 |
| RR/7/347 | Referee's report by Henry John Carter on a paper 'On the echinoidea of the ’porcupine‘ deep-sea dredging-expeditions' by Charles Thomas Wyville Thomson | 10 June 1874 |
| RR/7/224 | Referee's report by George Busk, on a paper 'Structural elements of urinary calculi' by Henry John Carter | 15 April 1873 |
| EC/1859/03 | Carter, Henry John: certificate of election to the Royal Society | |
| MS/787/1/53 | Letter from Henry J[ohn] Carter, the Cottage, Budleigh Salterton, Devon, to H[enry] B[owman] Brady | 23 April 1888 |
| MC/9/443 | Letter from Henry [John] Carter, 'The Cottage', Budleigh Salterton, Devon, to W [Walter] White, Assistant Secretary of the Royal Society, Burlington House, London | 9 December 1872 |
| RR/5/30 | Referee's report by Henry John Carter, on a paper 'On the anatomy and physiology of the Spongiadae.—Part II' by James Scott Bowerbank | 19 September 1862 |
| MC/9/435 | Letter from Th [Thomas] Biddulph, Buckingham Palace, to W [William] Sharpey, [Secretary of the Royal Society] | 14 November 1872 |
| MC/9/433 | Letter from Henry [John] Carter, 'The Cottage', Budleigh Salterton, Devon, to Professor [William] Sharpey, Secretary of the Royal Society | 13 November 1872 |
| MC/9/446 | Letter from Henry [John] Carter, 'The Cottage', Budleigh Salterton, Devon, to Walter White, [Assistant Secretary of the Royal Society], Burlington House, London | 11 December 1872 |
| MC/9 | Volume 9 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1870-June 1873 |
| RR/6/289 | Referee's report by Henry John Carter, on two papers 'On Holtenia, a genus of vitreous sponges' by Charles Thomas Wyville Thomson and 'On Palaeocoryne, a genus of tubularine hydrozoa from the Carboniferous formation' by Peter Martin Duncan and H M Jenkins | 9 August 1869 |
| MC/16 | Volume 16 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1893-1896 |