| RefNo | Title | Date |
| EC/1830/12 | Lloyd, John Augustus: certificate of election to the Royal Society | |
| MC/3/309 | Letter from John Augustus Lloyd, Port-Louis, Mauritius, to the Secretary of the Royal Society | 4 November 1843 |
| IM/002786 | Lloyd, John Augustus | 1851 |
| MC/1/291 | Letter from John Augustus Lloyd, 19 [John] Adam Street, Adelphi, to John George Children, Secretary of the Royal Society | 16 March 1831 |
| MS/425/10 | Copy letter, John William Lubbock, Treasurer of the Royal Society, to [John] Augustus Lloyd | 17 March 1831 |
| MS/426/77 | Copy letter from J W L [John William Lubbock], Treasurer of the Royal Society; to J R [John Rae] Reid-Bart M P | 12 January 1844 |
| MC/4/161 | Letter from Lieutenant-Colonel [John Augustus] Lloyd, [colonial civil engineer], Mauritius, to the Secretary of the Royal Society | 3 November 1846 |
| MS/426/384 | Copy letter from C R [Charles Richard] Weld, the Assistant Secretary of the Royal Society; to Captain [Sidney?] Shippard | 9 June 1849 |
| MS/170 | Documents relating to John Augustus Lloyd's paper on the difference of level of the Atlantic and Pacific Oceans | 1830 |
| PT/19/13/2 | Plate, 'Navy well, Sheerness Yard' by unknown artist | [1830] |
| PT/19/13/1 | Plate, 'Situation of the standard marks in the Isles of Grain and Sheppey' by unknown artist | [1830] |
| PT/19/11 | Letter, regarding tides in Sheerness from J [James] Mitchell to John Augustus Lloyd | 6 June 1830 |
| MC/1/233 | Letter from John Augustus Lloyd, 5 Whitehall Place, Gravesend, to Davies Gilbert, President of the Royal Society, Bridge Street, Westminster | 5 June 1830 |
| MC/1/249 | Letter from John Augustus Lloyd, 2 Circus Street, Greenwich, to Davies Gilbert, President of the Royal Society | 19 July 1830 |
| PT/19/13 | Plates, relating to 'An account of operations carried on for ascertaining the difference of level between the River Thames at London Bridge and the sea; and also for determining the height above the level of the sea, &c. of intermediate points passed over between Sheerness and London Bridge' by John Augustus Lloyd | [1830] |
| MC/1/248 | Letter from Dr. Peter Mark Roget, [Secretary of the Royal Society], to [John Augustus] Lloyd | 17 July 1830 |
| MC/1/251 | Letter from John Augustus Lloyd, Greenwich, to Davies Gilbert, President of the Royal Society, Bodmyn, Cornwall | 28 July 1830 |
| PT/19/12 | Letter, correcting tidal observations from John Hansfield to John Augustus Lloyd | 17 December 1830 |
| MC/1/262 | Letter from John Augustus Lloyd, Admiralty Office, to Davies Gilbert | 10 December 1830 |
| MC/1/289 | Letter from John Augustus Lloyd, 19 [John] Adam Street, Adelphi, to [Prince Augustus Frederick], the Duke of Sussex, President of the Royal Society, | 15 March 1831 |
| MC/1/300 | Letter from James Hudson, [Assistant Secretary of the Royal Society], to the Royal Society | 5 April 1831 |
| MC/3 | Volume 3 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1839-1843 |
| MC/3/116 | Letter from Major Edward Sabine, 3 St James's Place, to John Frederic Daniell, Foreign Secretary of the Royal Society | 17 November 1840 |
| MC/3/117 | Letter from John Frederic Daniell, Foreign Secretary of the Royal Society, to Captain [John Augustus] Lloyd | 20 November 1840 |
| MC/3/276 | Letter from John Augustus Lloyd, Port-Louis, Mauritius, to the Secretary of the Royal Society | 3 May 1843 |
| PT/19/10 | Observations, from 'An account of operations carried on for ascertaining the difference of level between the River Thames at London Bridge and the sea; and also for determining the height above the level of the sea, &c. of intermediate points passed over between Sheerness and London Bridge' by John Augustus Lloyd | [1831] |
| MC/1 | Volume 1 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1800-1831 |
| MS/426/250 | Copy letter from C R [Charles Richard] Weld, the Assistant Secretary of the Royal Society; to Lieut Col J A [John Augustus] Lloyd, Mauritius | 15 January 1847 |
| MC/4 | Volume 4 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1844-1850 |
| AP/23/35 | Unpublished paper, 'Second series of approximate deductions made from about 50,000 observations taken during the years 1836, 1837 & 1838 at the Port Louis Observatory Mauritius, four times each day' by J A [John Augustus] Lloyd | 30 October 1839 |
| AP/21/5 | Unpublished observations, 'Meteorological deductions made from observations made at the Observatory, Port Louis, Mauritius' by John Augustus Lloyd | 1837 |
| MS/257/2/263 | Letter from John Frederick William Herschel, Feldhausen to John Augustus Lloyd, Port Louis, Mauritius | 12 March 1835 |