| RefNo | Title | Date |
| AP/18/7/3 | Unpublished illustration, 'Cove where HMS Thetis was wrecked' by Commander J F F [John Frederick Fitzgerald] De Roos | 1834 |
| AP/18/7/5 | Unpublished illustration, 'Exact state of the bottom on arrival of HM sloop Algerine' by Commander J F F [John Frederick Fitzgerald] De Roos | 1834 |
| AP/18/7/2 | Unpublished illustration, 'Island and port of Cape Frio' by Commander J F F [John Frederick Fitzgerald] De Roos | 1834 |
| AP/18/5c | Unpublished letter, regarding reports on the wreck of HMS Thetis from W H [William Henry] Smyth to J G [John George] Children | 19 April 1834 |
| EC/1831/20 | Roos, John Frederick Fitzgerald De: certificate of election to the Royal Society | |
| AP/18/5d | Unpublished copy of letter, regarding reports on the wreck of HMS Thetis from W H [William Henry]Smyth to J G [John George] Children | 19 April 1834 |
| AP/18/5b | Unpublished letter, regarding a report on the wreck of HMS Thetis from Frederick de Roos to [Peter Mark Roget] | 14 April 1834 |
| AP/18/7 | Unpublished paper, 'An account of some operations executed at Cape Frio [Cabo Frio] by the officers and crew of HMS Algerine, for the purpose of raising part of the stores etc lost in HMS Thetis' by Commander J F F [John Frederick Fitzgerald] De Roos | 1834 |
| AP/18/4/2 | Unpublished letter, regarding the recovery of the wrecked frigate HMS Thetis from Thos [Thomas] Dickinson to the Royal Society | 12 March 1834 |
| AP/18/7/1 | Unpublished manuscript, 'An account of some operations executed at Cape Frio [Cabo Frio] by the officers and crew of HMS Algerine, for the purpose of raising part of the stores etc lost in HMS Thetis' by Commander J F F [John Frederick Fitzgerald] De Roos | 1834 |
| AP/18/7/6 | Unpublished illustration, 'State of the bottom at the conclusion of the enterprise' by Commander J F F [John Frederick Fitzgerald] De Roos | 1834 |
| AP/19/23 | Unpublished paper, 'On the influence of the respiratory organs in regulating the quantity of blood within the heart' by James Wardrop | 1835 |
| AP/18/7/4 | Unpublished illustration, recovery of treasures from HMS Thetis by Commander J F F [John Frederick Fitzgerald] De Roos | 1834 |
| AP/18/4 | Unpublished paper, 'Narrative of the proceedings of Commander Thomas Dickinson of His Majesty's sloop Lightning, while employed in the enterprise for the recovery of the public stores and other property sunk in His Majesty's late frigate "Thetis", on the S W side of the island of Cape Frio [Cabo Frio]' by Thos [Thomas] Dickinson | 1834 |
| AP/18/4/1 | Unpublished manuscript, 'Narrative of the proceedings of Commander Thomas Dickinson of His Majesty's sloop Lightning, while employed in the enterprise for the recovery of the public stores and other property sunk in His Majesty's late frigate 'Thetis', on the S W side of the island of Cape Frio [Cabo Frio]' by Thos [Thomas] Dickinson | 1834 |