| RefNo | Title | Date |
| EC/1901/13 | Thomas, Michael Rogers Oldfield: certificate of election to the Royal Society | |
| IM/004542 | Thomas, Michael Rogers Oldfield | nd |
| IM/Maull/004541 | Thomas, Michael Rogers Oldfield | nd |
| NLB/4/71 | Copy letter from Herbert Rix, to Charles Berjean | 3 February 1890 |
| NLB/1/530 | Copy letter from Herbert Rix, to Michael Rogers Oldfield Thomas | 20 July 1887 |
| NLB/4/72 | Copy letter from Herbert Rix, to Michael Rogers Oldfield Thomas, British Museum Natural History, S.W. | 3 February 1890 |
| NLB/3/494 | Copy letter from an unknown correspondent, to Harrison & Sons | 25 June 1889 |
| NLB/3/1032 | Copy letter from Herbert Rix, to Michael Rodgers Oldfield Thomas, British Museum Natural History, Cromwell Road, S.W. | 18 December 1889 |
| NLB/31/256 | Copy letter from Robert William Frederick Harrison, to Michael Rogers Oldfield Thomas, Fellow of the Royal Society, 9 St Petersburg Place, Bayswater, W. | 15 July 1905 |
| NLB/43/44/4 | Copy letter from Robert William Frederick Harrison, to [Michael Rogers] Oldfield Thomas, Fellow of the Royal Society | 27 October 1910 |
| NLB/52/455 | Copy letter from [Robert William Frederick Harrison, Assistant Secretary of the Royal Society]; to Messrs Harrison & Sons | 14 December 1915 |
| NLB/47/114 | Copy letter from Robert William Frederick Harrison to [Michael Rogers] Oldfield Thomas FRS | 3 December 1912 |
| NLB/51/551 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society to Thomas Michael Rogers Oldfield FRS | 23 April 1915 |
| NLB/51/585 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society to Michael Rogers Oldfield Thomas FRS | 30 April 1915 |
| NLB/72/349 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to [Reginald Innes] Pocock, FRS | 10 July 1929 |
| NLB/72/706 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to [Reginald Innes] Pocock Esq., FRS | 13 March 1930 |
| MC/20/424 | Letter from [Michael Rogers] Oldfield Thomas, British Museum (Natural History), Cromwell Road, London, to Professor [Joseph] Larmor | 24 July 1905 |
| MC/20/423 | Letter from [Michael Rogers] Oldfield Thomas, 9 St Petersburg Place, Bayswater, to Professor [Joseph] Larmor | 16 July 1905 |
| NLB/3/495 | Copy letter from Herbert Rix, to Michael Rogers Oldfield Thomas, British Museum (Natural History) | 25 June 1889 |
| RR/10/90 | Referee's report by Edwin Ray Lankester, on a paper 'On the homologies and succession of the teeth in Dasyuridae, with an attempt to trace the history of the evolution of mammalian teeth in general' by Michael Rogers Oldfield Thomas | 13 June 1887 |
| PP/14/11 | Paper, 'On the dentition of Ornithorhynchus [platypus]' by [Michael Rogers] Oldfield Thomas | 1889 |
| PP/15/18 | Paper, 'A milk dentition in Orcyteropus [aardvark]' by Oldfield Thomas | 1889 |
| RR/10/91 | Referee's report by Adam Sedgwick, on a paper 'On the homologies and succession of the teeth in Dasyuridae, with an attempt to trace the history of the evolution of mammalian teeth in general' by Michael Rogers Oldfield Thomas | 11 July 1887 |
| MC/20 | Volume 20 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1905 |