| RefNo | Title | Date |
| EC/1924/05 | Groom, Percy: certificate of election to the Royal Society | |
| NLB/8/113 | Copy letter from Herbert Rix, to the Cambridge Engraving Company | 18 July 1893 |
| NLB/8/149 | Copy letter from Herbert Rix, to Professor Michael Foster, Secretary, Royal Society | 21 July 1893 |
| NLB/14/398 | Copy letter from Robert William Frederick Harrison, to William Turner Thiselton-Dyer, Fellow of the Royal Society, Chairman of the Botany Committee | 5 March 1897 |
| NLB/14/423 | Copy letter from Robert William Frederick Harrison, to Professor Michael Foster, Secretary, Royal Society | 8 March 1897 |
| NLB/14/688 | Copy letter from Robert William Frederick Harrison, to William Turner Thiselton-Dyer, Fellow of the Royal Society | 29 April 1895 |
| NLB/14/733 | Copy letter from Michael Foster, to Professor Sydney Howard Vines, Fellow of the Royal Society | 5 May 1897 |
| NLB/35/244 | Copy letter from Archibald Geikie, to Professor Percy Groom | 3 May 1907 |
| NLB/35/195 | Copy letter from Robert William Frederick Harrison, to Dr Dukinfield Henry Scott, Fellow of the Royal Society | 30 April 1907 |
| RR/11/159 | Referee's report by Isaac Bayley Balfour, on a paper 'On Dischidia rafflesiana' by Percy Groom | 15 April 1873 |
| RR/32/46 | Referee's report by Percy Groom, on a paper 'The genus dreyfusia (order hemiptera, family chermesidae) in Britain, and its relation to the silver fir' by R N Chrystal | May 1925 |
| RR/11/158 | Referee's report by William Turner Thiselton-Dyer, on a paper 'On Dischidia rafflesiana' by Percy Groom | 26 February 1893 |
| RR/13/188 | Letter from Robert Harrison, Assistant Secretary of the Royal Society, on a paper 'On the leaves of lathraea squamaria' by Percy Groom to William Turner Thiselton-Dyer | 29 April 1897 |
| RR/13/187 | Referee's report by Isaac Bayley Balfour, on a paper 'On the leaves of lathraea squamaria' by Percy Groom | 28 April 1897 |
| RR/17/166 | Referee's report by James William Helenus Trail, on a paper 'Longitudinal symmetry in Phanerogamia' by Percy Groom | [February 1907] |
| RR/17/168 | Referee's report by David Prain, on a paper 'Longitudinal symmetry in Phanerogamia' by Percy Groom | [March 1907] |
| PP/21/3 | Paper, 'On Dischidia rafflesiana' by Percy Groom | 1893 |
| RR/17/167 | Referee's report by Frederick Orpen Bower, on a paper 'Longitudinal symmetry in Phanerogamia' by Percy Groom | [February 1907] |