| RefNo | Title | Date |
| AB/1/2/1/67 | Receipt for money received by Charles Morton from Mr West, Treasurer | 19 November 1764 |
| MM/4/7 | Letter from J West, Stratford, to Charles Morton | 31 May 1762 |
| AB/1/2/2/3 | Letter from Charles Morton to James West | 1 July 1762 |
| MM/3/14 | Letter from Alexander Dalrymple, London, to Dr Charles Morton, Secretary, Royal Society | 7 December 1767 |
| MM/10/124 | Letter from Charles Mason, Portsmouth, to Charles Morton | 8 December 1760 |
| MM/10/140 | Letter from Robert James, East India Company, to Charles Morton | 9 April 1762 |
| MM/10/138 | Letter from Charles Morton, Royal Society, to Laurence Sullivan, Chairman, and to the Court of Directors of the East India Company | 28 November 1761 |
| MM/10/135 | Letter from Charles Mason, Cape of Good Hope, to Charles Morton | 6 May 1761 |
| MM/3/77 | Letter from Daines Barrington to Dr Charles Morton | 2 August 1773 |
| L&P/5/59 | Letter, 'Weather at Totnes' from Edward Spry to Charles Morton | 11 October 1768 |
| L&P/2/434 | Paper, 'An account of the Select Anatomical Observations (Uterus) by Philip Adolph Bohmer' by Charles Morton | 1753 |
| L&P/4/365 | Letter, 'Of the protection of buildings from lightning' from Paolo Frisi to Charles Morton | 17 October 1766 |
| L&P/2/460 | Letter, 'Of a supposed worm from the urethra' from Charles Morton to Henry Baker | 4 October 1753 |
| L&P/4/340/1 | Letter, 'Of a clock showing the age and phases of the Moon and the tides' from James Ferguson to Charles Morton | 23 March 1766 |
| L&P/4/301 | Letter, 'Of the eclipse of the sun on 16 August 1765' by Joannes Luloss to Charles Morton | 5 November 1765 |
| L&P/5/86 | Letter, 'Of interpreting Egyptian hieroglyphics' from James Stuart to Charles Morton | 25 March 1769 |
| L&P/5/115 | Letter, 'Update on Endeavour voyage' from James Cook to Charles Morton | 20 November 1768 |
| L&P/5/102 | Letter, 'Of the late transit of Venus, with observations from Six, Ridout and Dean' from W D Brych to Charles Morton | 6 June 1769 |
| L&P/5/103 | Letter, 'Of the late transit of Venus' from Samuel Dunn to Charles Morton | 7 June 1769 |
| L&P/4/65 | Letter, 'Of some plates of white glass found at Herculaneum' from John Nixon to Charles Morton | 3 February 1761 |
| L&P/4/73 | Letter, 'Of Dr Wilkin's 'Essay towards a real character and a philosophical language'' from T Cunningham to Charles Morton | 3 March 1761 |
| L&P/5/316 | Letter, 'Of the cavern in Dunmore Park, near Kilkenny' from Adam Walker to Charles Morton | 20 April 1771 |
| L&P/5/54 | Letter, 'Of astronomical observations at Ewetzingen in 1767-8' from Christian Mayer to Charles Morton and James Douglas | 1768 |
| L&P/5/217 | Letter, 'Of the weather at Plymouth' from John Corham Huxham to Charles Morton | 26 January 1771 |
| L&P/5/163 | Letter, 'Some rare British birds' from Daines Barrington to Charles Morton | 14 March 1770 |
| EC/1751/12 | Morton, Charles: certificate of election to the Royal Society | |
| AB/1/2/1/45 | Letter from Peter Davall to Dr [Charles] Morton at the British Museum | 2 July 1762 |
| MM/10/130 | Letter from Charles Mason and Jeremiah Dixon, Plymouth, to Charles Morton | 25 January 1761 |
| MM/10/127 | Receipt for instruments from the Royal Society, with schedule | 27 December 1760 |
| MM/10/139 | Letter from Robert James, East India Company, to Charles Morton | 3 December 1761 |
| MM/10/128 | Letter from Charles Mason, Portsmouth, to Charles Morton | 12 January 1761 |
| MM/10/113 | Letter from L Sullivan, Chairman of the East India Company to Charles Morton Secretary of the Royal Society | 1760 |
| MM/10/115 | Charles Morton to Lawson and Sullivan Esqrs. of the East India Company | 16 October 1760 |
| MM/4/6 | Draft letter from Charles Morton | 18th century |
| MM/4/74 | Letter from Prince Masserano, Aranjuez, to Charles Morton | 30 April 1773 |
| MM/4/73 | Letter from Prince Masserano, Aranjuez, to Charles Morton | 30 April 1773 |
| L&P/5/76 | Letters, 'On a specimen of native tin' from Henry Rosevarne and William Borlase to Charles Morton | 27 January 1769 |
| MM/10/114 | Letter from Robert James of the East India Company to Dr Charles Morton of the Royal Society | 16 October 1760 |
| AP/4/15/1 | Unpublished translation of letter, 'Mr Turberville Needham, FRS, and, his enquiries after a connection between certain Egyptian hieroglyphics, and the modern writing of China' from A [Alban?] Butler and C [Charles] Morton | 1762 |
| AP/4/15/2 | Unpublished translation of letter, regarding Chinese language and history from an unknown priest to the Royal Society | 1762-1764 |
| L&P/4/150 | Letter, 'In defense of Mercator's chart' from William Mountaine to Charles Morton | 26 January 1763 |
| AP/4/15 | Unpublished translations of letters, 'Mr Turberville Needham, FRS, and, his enquiries after a connection between certain Egyptian hieroglyphics, and the modern writing of China' from A [Alban?] Butler, C [Charles] Morton, and Jesuit priests | 1762-1764 |
| L&P/5/159 | Letter, 'An improved wheel barometer' by Keane Fitzgerald to Charles Morton | 8 November 1769 |
| L&P/5/142 | Paper, 'Of Mr Tuberville Needham's conjecture as to the connexion between Egyptian hieroglyphics and the Chinese charters' by Charles Morton | 1769 |
| L&P/6/11 | Letter, 'Of the disparation of Saturn's ring' from Josef Varelaz to Charles Morton | 12 October 1773 |