| RefNo | Title | Date |
| PB/4/8/46 | Correspondence with Hugh Hamshaw Thomas on Bernal's report on effetcs of air raids, described as 'completely unreliable and misleading' | 1942 |
| RR/17/117 | Referee's report by Francis Wall Oliver, on a paper 'On the structure of Sigillaria scutellata, Brongn., and other Eusigillarian stems, in comparison with those of other Palaeozoic lycopods' by E. A. Newell Arber and Hugh Hamshaw Thomas | [February 1907] |
| RR/17/116 | Referee's report by Robert Kidston, on a paper 'On the structure of Sigillaria scutellata, Brongn., and other Eusigillarian stems, in comparison with those of other Palaeozoic lycopods' by E. A. Newell Arber and Hugh Hamshaw Thomas | 29 November 1907 |
| RR/22/112 | Referee's report by Dukinfield Henry Scott, on a paper 'On williamsoniella, a new type of bennettitalean flower' by Hugh Hamshaw Thomas | 9 July 1915 |
| RR/18/89 | Referee's report by Francis Wall Oliver, on a paper 'On the leaves of calamites (calamocladus section)' by Hugh Hamshaw Thomas | January 1911 |
| RR/18/88 | Referee's report by Dukinfield Henry Scott, on a paper 'On the leaves of calamites (calamocladus section)' by Hugh Hamshaw Thomas | 5 January 1911 |
| RR/22/113 | Referee's report by Robert Kidston, on a paper 'On williamsoniella, a new type of bennettitalean flower' by Hugh Hamshaw Thomas | July 1915 |
| RR/47/124 | Referee's report by Dukinfield Henry Scott, on a paper 'On some pteridospermous plants from the Mesozoic rocks of South Africa' by Hugh Hamshaw Thomas | 9 September 1932 |
| RR/58/45 | Referee's report by Hugh Hamshaw Thomas, on a paper 'On the plant-remains from the downtonian of England and Wales' by William Henry Lang | 20 November 1936 |
| RR/61/86 | Referee's report by Hugh Hamshaw Thomas, on a paper 'The wood anatomy of the family Sterculiaceae' by M M Chattaway | 27 May 1937 |
| RR/67/228 | Referee's report by Hugh Hamshaw Thomas, on a paper 'Cones of extinct cycladales from the Jurassic rocks of Yorkshire' by Tom M Harris | 1940 |
| RR/68/38 | Referee's report by Hugh Hamshaw Thomas, on a paper 'The lower Devonian flora of the Senni Beds of Monmouthshire and Breconshire' by W N Croft and William Henry Lang | 28 July 1941 |
| RR/69/318 | Second referee's report by E J Marshall and Hugh Hamshaw Thomas, on a paper 'Experimental investigations of the shoot apex of Dryopteris aristata Druce' by C W Wardlaw | 1946 |
| RR/72/269 | Referee's report by Hugh Hamshaw Thomas, on a paper 'The comparative investigation of apices of vascular plants by experimental methods' by C W Wardlaw | 1949 |
| NLB/73/298 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Dr. [Hugh] Hamshaw Thomas, Downing College, Cambridge | 9 May 1931 |
| EC/1934/16 | Thomas, Hugh Hamshaw: certificate of election to the Royal Society | |
| RR/31/72 | Referee's report by Frederick Orpen Bower, on a paper 'The Caytoniales, a new group of Angiospermous plants from the Jurassic rocks of Yorkshire' by Hugh Hamshaw Thomas | [July 1924] |
| RR/31/73 | Referee's report by Dukinfield Henry Scott, on a paper 'The Caytoniales, a new group of Angiospermous plants from the Jurassic rocks of Yorkshire' by Hugh Hamshaw Thomas | 30 July 1924 |
| RR/47/123 | Referee's report by William Henry Lang, on a paper 'On some pteridospermous plants from the Mesozoic rocks of South Africa' by Hugh Hamshaw Thomas | August 1932 |
| RR/62/81 | Referee's report by Hugh Hamshaw Thomas, on a paper 'On the factors that influence external form of fossil plants; with descriptions of the foliage of some species of the Palaeozoic Equisetalean Genus Annularia Sternberg' by John Walton | 12 February 1936 |
| RR/71/271 | Referee's report by Hugh Hamshaw Thomas, on a paper 'Further experimental investigations of the shoot apex of Dryopteris aristata Druce' by C W Wardlaw | 3 April 1948 |
| RR/69/320 | Referee's report by Hugh Hamshaw Thomas, on a paper 'Experimental investigations of the shoot apex in ferns. Parts I, II and III' by C W Wardlaw | 14 October 1945 |
| RR/76/11 | Referee's report by Hugh Hamshaw Thomas, on a paper 'The fructification of Czekanowskia and its allies' by Thomas Maxwell Harris | 14 February 1951 |