| RefNo | Title | Date |
| EC/1828/08 | Lardner, Dionysius: certificate of election to the Royal Society | |
| MC/1/355 | Letter from Dionysius Lardner, 122 Regent Street, to Dr. [Peter Mark] Roget, Secretary of the Royal Society | 16 December 1831 |
| IM/002632 | Lardner, Dionysius | nd |
| RR/1/137 | Referee's report by William Hasledine Pepys, on a paper 'On certain properties of vapour' by Dionysius Lardner | [c.1832] |
| MC/1 | Volume 1 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1800-1831 |
| AP/15/22 | Unpublished paper, 'On certain properties of vapor' by Dionysius Lardner | [1832] |
| AP/20/9 | Unpublished paper, regarding railways by D [Dionysius] Lardner | 1836 |
| RR/1/138 | Referee's report by James Cumming, on a paper 'On certain properties of vapour' by Dionysius Lardner | [c.1832] |
| MS/425/643 | Copy letter, JWL [John William Lubbock], RS [Royal Society], to Dr [Dionysius] Lardner | 22 February 1840 |
| HS/11/112 | Letter, from Dionysius Lardner to Sir John Herschel, dated at 33 Percy St., Bedford Square | 18 February 1829 |
| HS/11/122 | Letter, from Dionysius Lardner to Sir John Herschel, dated at 122 Regent St. | 5 April 1832 |
| HS/11/110 | Letter, from Dionysius Lardner to Sir John Herschel, dated at 33 Percy St., Bedford Square | 30 December 1828 |
| HS/11/108 | Letter, from Dionysius Lardner to Sir John Herschel, dated at 33 Percy St., Bedford Square | 28 July 1828 |
| HS/11/106 | Letter, from Dionysius Lardner to Sir John Herschel, dated at 33 Percy St., Bedford Square | 18 July 1828 |
| HS/25/1/4 | Copy letter, from Sir John Herschel to Dionysius Lardner, dated at Slough | 27 June 1830 |
| HS/25/1/27 | Copy letter, from Sir John Herschel to Dionysius Lardner, dated at Slough | 2 March 1831 |
| HS/25/1/21 | Copy letter, from Sir John Herschel to Dionysius Lardner, dated at Slough | 21 February 1831 |
| HS/11/116 | Draft letter, from Sir John Herschel to Dionysius Lardner, dated at Slough | 1 February 1830 |
| HS/11/111 | Draft letter, from Sir John Herschel to Dionysius Lardner, dated at Slough | 16 February 1829 |
| HS/21/39 | Copy of draft letter, from Sir John Herschel to Dionysius Lardner, dated at Slough | 16 February 1829 |
| HS/11/109 | Copy letter, from Sir John Herschel to Dionysius Lardner, dated at Slough | 1 August 1828 |
| HS/21/40 | Copy letter, from Sir John Herschel to Dionysius Lardner, dated at 12 Charlotte St. | 28 February 1829 |
| HS/11/114 | Copy letter, from Sir John Herschel to Dionysius Lardner, dated at 12 Charlotte St. | 28 February 1829 |
| HS/11/124 | Draft letter, from Sir John Herschel to Dionysius Lardner, dated at Feldhausen | 28 February 1838 |
| HS/11/113 | Letter, from Dionysius Lardner to Sir John Herschel, dated at 33 Percy St., Bedford Square | 19 February 1829 |
| HS/11/115 | Letter, from Dionysius Lardner to Sir John Herschel, dated at Royal Chambers, St. James | 19 January 1830 |
| HS/11/117 | Letter, from Dionysius Lardner to Sir John Herschel, dated at 122 Regent St. | 21 September 1830 |
| HS/11/119 | Letter, from Dionysius Lardner to Sir John Herschel, dated at 122 Regent St. | 2 October 1830 |
| HS/11/120 | Letter, from Dionysius Lardner to Sir John Herschel, dated at 122 Regent St. | 6 December 1830 |
| HS/11/121 | Letter, from Dionysius Lardner to Sir John Herschel, dated at 122 Regent St. | 24 February 1831 |
| HS/11/123 | Letter, from Dionysius Lardner to Sir John Herschel, dated at Great Queen St. | 3 October 1837 |
| HS/21/24 | Copy letter, from Sir John Herschel to Dionysius Lardner, dated at Slough | 1 August 1828 |
| HS/21/23 | Copy letter, from Sir John Herschel to Dionysius Lardner, dated at Isle of Wight | 25 July 1828 |
| HS/21/74 | Copy of draft letter, from Sir John Herschel to Dionysius Lardner | 1830-9 |
| HS/11/118 | Draft letter, from Sir John Herschel to Dionysius Lardner | September 1830 |
| HS/25/1/2 | Copy letter, from Sir John Herschel to Dionysius Lardner, dated at Slough | 22 May 1830 |
| MS/957/17 | Letter from Dionysius Lardner, Trinity College, Dublin, to 'Dear Sir' [Henry Kater] | 15 February [1827] |
| HS/11/107 | Draft letter, from Sir John Herschel to Dionysius Lardner, dated at Isle of Wight | 25 July 1828 |
| HS/21/56 | Copy of draft letter, from Sir John Herschel to Dionysius Lardner, dated at Slough | 1 February 1830 |
| HS/21/243 | Copy of draft letter, from Sir John Herschel to Dionysius Lardner, dated at Feldhausen | 28 February 1838 |
| MS/425/79 | Copy letter, James Hudson, Assistant Secretary of the Royal Society, to Dr [Dionysius] Lardner | 17 May 1832 |