| RefNo | Title | Date |
| EC/1825/08 | Mantell, Gideon Algernon: certificate of election to the Royal Society | |
| IM/002954 | Mantell, Gideon Algernon | nd |
| IM/002952 | Mantell, Gideon Algernon | 2002 |
| MS/709/37 | Letter from Gideon Mantell, Castle Place, to James Sowerby, 2 Mead Place, Lambeth, Surrey | 19 April 1817 |
| PT/35/10/10 | Plate, scapula, coracoid, and vertebrae of the iguanodon by G [George Johann] Scharf | [1849] |
| P/0087 | Portrait of Mantell, Gideon | |
| IM/002953 | Mantell, Gideon Algernon | nd |
| IM/000536 | Mantell, Gideon Algernon | February 2003 |
| IM/002951 | Mantell, Gideon Algernon | nd |
| MC/2/67 | Letter from Gideon [Algernon] Mantell, Castle Place, Lewes, to Dr. Peter Mark Roget, Secretary of the Royal Society | December 1832 |
| MS/251/31 | Letter from Gideon Algernon Mantell, Castle Place, to [William Buckland] | 15 June 1829 |
| MS/251/30 | Letter from Gideon Algernon Mantell, Castle Place, to [William Buckland] | 3 June 1829 |
| MS/426/213 | Copy letter from S H [Samuel Hunter] Christie, Secretary of the Royal Society; to G A [Gideon Algernon] Mantell | 3 July 1846 |
| IM/002955 | Mantell, Gideon Algernon | nd |
| IM/002956 | Mantell, Gideon Algernon | nd |
| MS/251/22 | Letter from Gideon Algernon Mantell, Castle Place, Lewes, to William Buckland, President of the Geological Society, 20 Bedford Street, Covent Garden, London | 16 June 1825 |
| MS/251/29 | Letter from Gideon Algernon Mantell, Castle Place, to William Buckland, Somerset House, London | 12 May 1829 |
| PT/34/11 | Paper, 'On the structure of the jaws and teeth of the iguanodon' by Gideon Algernon Mantell | 24 May 1848 |
| PT/35/10/12 | Plate, vertebral column of the hylæosaurus by J [Joseph] Dinkel | [1849] |
| PT/35/10/2 | Plate, 'Part of the Maidstone iguanodon' by unknown artist | [1849] |
| PT/35/10/4 | Plate, 'Sacrum of the iguanodon' by West | [1849] |
| PT/25/5/3 | Plate, figures 6-7 showing trionyx femur and turtle mandible by unknown artist | May 1841 |
| PT/25/5/2 | Plate, figures 1-5 showing turtle ribs and coracoids by Gideon Algernon Mantell | May 1841 |
| PT/25/5/1 | Manuscript, 'On the fossil remains of turtles, discovered in the chalk formation of the south east of England' by Gideon Algernon Mantell | May 1841 |
| PT/34/10/2 | Plate, figures I and Ia showing the apical portion of the phragmocone of a belemnoteuthis by [Joseph] Dinkel | [1848] |
| PT/35/10/11 | Plate, 'Humeri of the iguanodon' by G [George Johann] Scharf | [1849] |
| PT/35/10/5 | Plate, visceral aspect of the sacrum of the hylæosaurus by [Joseph] Dinkel and West | [1849] |
| PT/35/10/7 | Plate, vertebrae of the iguanodon by [Joseph] Dinkel and G [George Johann] Scharf | [1849] |
| PT/34/10/4 | Plate, figures I-III showing osselets of belemnites and the largest specimen of belemnite structure by Jos [Joseph] Dinkel | [1848] |
| PT/34/10/1 | Manuscript, 'Observations on some belemnites, and other fossil remains of cephalopoda, discovered by Sir Reginald Neville Mantell C E in the Oxford clay near Trowbridge in Wiltshire' by Gideon Algernon Mantell | February 1848 |
| PT/34/10/3 | Plate, figures II-IV from plate XIII and figure I from plate XIV showing a peristome, an ammonites jasoni, and an outline of the belemnoteuthis by [Joseph] Dinkel | [1848] |
| PT/35/10/8 | Plate, vertebrae of the iguanodon by [Joseph] Dinkel and G [George Johann] Scharf | [1849] |
| PT/35/10/6 | Plate, lateral aspect of the sacrum of the hylæosaurus by [Joseph] Dinkel and West | [1849] |
| PT/38/4 | Paper, 'Supplementary observations on the structure of the belemnite and belemnoteuthis' by Gideon Algernon Mantell | October 1849 |
| MC/2 | Volume 2 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1832-1838 |
| PT/35/10/3 | Plate, 'Pectoral arch of the iguanodon' by unknown artist | [1849] |
| PT/35/10/9 | Plate, vertebrae of the iguanodon by [Joseph] Dinkel and G [George Johann] Scharf | [1849] |
| PT/38/3 | Paper, 'On a dorsal dermal spine of the hylæosaurus recently discovered in the strata of Tilgate Forest' by Gideon Algernon Mantell | June 1850 |
| RR/2/146 | Referee's report by Robert Edmond Grant, on a paper 'Supplementary observations on the structure of the Belemnite and Belemnoteuthis' by Gideon Algernon Mantell | 5 June 1850 |
| PT/25/5 | Paper, 'On the fossil remains of turtles, discovered in the chalk formation of the south east of England' by Gideon Algernon Mantell | May 1841 |
| PT/75/3/14 | Painting, 'The body of a Rotalia' by Joseph Dinkel | [1846] |
| MC/4/122 | Letter from Gideon Algernon Mantell to the [Marquis of Northampton] President of the Royal Society and to the Council | 2 February 1846 |
| PT/73/11/11 | Paintings, 'Teeth of the iguanodon, a newly discovered fossil animal, from the sandstone of Tilgate Forest, in Sussex' by unknown artist | [1825] |
| PT/75/3/13 | Paintings, fossilised and recent Rotalia by Jos [Joseph] Dinkel | [1846] |
| PT/75/3/12 | Painting, 'Rotalia in chalk' by Joseph Dinkel | [1846] |
| PT/75/4/1 | Paintings, humeri of various saurians by [Joseph Dinkel] | [1849] |
| MS/426/335 | Copy letter from C R [Charles Richard] Weld, the Assistant Secretary of the Royal Society; to Dr [Gideon Algernon] Mantell | 21 July 1848 |
| MC/4/263 | Letter from [Gideon Algernon] Mantell, 19 Chester Square [?], to the Royal Society | 25 August 1848 |
| MC/4/253 | Letter from [Gideon Algernon] Mantell, 19 Chester Square, to the Royal Society | 24 July 1848 |
| PT/75/1/10 | Paintings, 'Emys benstedi. In the collection of Dr Mantell' by Jos [Joseph] Dinkel | [1841] |
| RR/1/162 | Referee's report by William Henry Fitton, on a paper 'Memoir on a portion of the lower jaw of the iguanodon, and on the remains of the hylaeosaurus and other saurians, discovered in the strata of Tilgate Forest, in Sussex' by Gideon Algernon Mantell | 10 May 1841 |
| MC/4/307 | Letter from [Charles Beaumont] Phipps, [Keeper of the Privy Purse], to [Charles Richard] Weld, [Assistant Secretary of the Royal Society] | 5 December 1849 |
| MC/4/302 | Letter from William Buckland [?] to the Chairman of the Committee for Geology and Paleontology | 24 November 1849 |
| PT/75/1/6 | Drawings, 'Teeth of the iguanodon' by G Scharf | [1841] |
| PT/75/3/16 | Painting, 'Part of the body of a Rotalia' by Joseph Dinkel | [1846] |
| MC/4 | Volume 4 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1844-1850 |
| PT/75/3/10 | Paintings, 'A Rotalia with remains of the soft parts in the shell' by Jos [Joseph] Dinkel | [1846] |
| PT/75/1/8 | Drawings, 'Iguanodon and other saurians' by G A [Gideon Algernon] Mantell | 1841 |
| PT/75/1/5 | Paintings, teeth of the iguanodon and hylaeosaurus by Lens Aldons | [1841] |
| PT/75/3/11 | Painting, 'Rotalia in flint' by Joseph Dinkel | [1846] |
| PT/75/3/9 | Painting, 'The body of a Rotalia in chalk' by Joseph Dinkel | [1846] |
| PT/75/3/15 | Painting, 'Rotalia from chalk' by Joseph Dinkel and J Mounsey | [1846] |
| PT/35/10 | Paper, 'Additional observations on the osteology of the iguanodon and hylæosaurus' by Gideon Algernon Mantell | 15 January 1849 |
| PT/35/10/1 | Manuscript, 'Additional observations on the osteology of the iguanodon and hylæosaurus' by Gideon Algernon Mantell | 15 January 1849 |
| PT/34/10/5 | Plate, figure V from plate XIII and figures IV-V from plate XV showing a phragmocone and the alveolar part of a guard of a belemnite by Jos [Joseph] Dinkel | [1848] |
| PT/34/10/6 | Plate, figures II-IV showing phragmocones and an outline of the known parts of a belemnite by Jos [Joseph] Dinkel | [1848] |
| PT/75/1/9 | Drawings, 'Hylaeosaurus' by G A [Gideon Algernon] Mantell | 1841 |
| PT/38/2 | Paper, 'On the pelorosaurus: an undescribed gigantic terrestrial reptile whose remains are associated with those of the iguanodon and other saurians in the strata of Tilgate Forest, in Sussex' by Gideon Algernon Mantell | November 1849 |
| PT/75/1/7 | Drawings, 'Osteological elements of the iguanodon' by G A [Gideon Algernon] Mantell | 1840 |
| PT/25/4 | Paper, 'Memoir on a portion of the lower jaw of the iguanodon and other saurian remains discovered in the strata of Tilgate Forest in Sussex' by Gideon Algernon Mantell | January 1841 |
| RR/2/263 | Referee's report by Gideon Algernon Mantell, on a paper 'Investigations into the structure and development of the scales and bones of fishes' by William Crawford Williamson | 2 July 1850 |
| RR/2/144 | Referee's report by Edward Forbes, on two papers 'On the Pelorosaurus; an undescribed gigantic terrestrial reptile whose remains are associated with those of the Iguanodon and other saurians in the strata of Tilgate Forest, in Sussex' and 'Supplementary observations on the structure of the Belemnite and Belemnoteuthis' by Gideon Algernon Mantell | 21 May 1850 |
| PT/31/3 | Paper, 'On the fossil remains of foraminifera in chalk' by Gideon Algernon Mantell | May 1846 |
| PT/34/10 | Paper, 'Observations on some belemnites, and other fossil remains of cephalopoda, discovered by Sir Reginald Neville Mantell C E in the Oxford Clay near Trowbridge in Wiltshire' by Gideon Algernon Mantell | February 1848 |
| RR/1/161 | Referee's report by Charles Lyell and Edward Forbes, on a paper 'Observations on some belemnites and other fossil remains of Cephalopoda, discovered by Mr. Reginald Neville Mantell, C. E. in the Oxford clay near Trowbridge, in Wiltshire' by Gideon Algernon Mantell | July 1848 |
| RR/2/145 | Referee's report by Robert Edmond Grant, on a paper 'On the Pelorosaurus; an undescribed gigantic terrestrial reptile whose remains are associated with those of the Iguanodon and other saurians in the strata of Tilgate Forest, in Sussex' by Gideon Algernon Mantell | 4 June 1850 |
| PT/75/1/4 | Paintings, 'Maxillary elements of the iguanodon and of the iguana' by G [George Johann?] Scharf | [1841] |
| PT/75/3/8 | Paintings, Xanthidium and Rotalia from chalk by Joseph Dinkel | [1846] |
| PT/75/4/2 | Drawings, 'Caudal vertebrae of Pelorosaurus conybearei from the strata of Tilgate Forest' by Jos [Joseph] Dinkel | 1849 |
| PT/75/1/10a | Paintings, 'Emys benstedi. In the collection of Dr Mantell' by Jos [Joseph] Dinkel | [1841] |
| AP/32/16 | Unpublished paper, 'On the geographical distribution of the Bulimi, a group of terrestrial Mollusca; and on the modification of their calcifying functions, according to the local physical conditions in which the species occur' by Lovell Reeve | 20 February 1850 |
| AP/32/16/1 | Unpublished manuscript, 'On the geographical distribution of the Bulimi, a group of terrestrial Mollusca; and on the modification of their calcifying functions, according to the local physical conditions in which the species occur' by Lovell Reeve | 20 February 1850 |