| Reference number | Title | Date |
| EC/1899/11 | Reid, Clement: certificate of election to the Royal Society | |
| IM/003779 | Reid, Clement | 1914 |
| NLB/20/81 | Copy letter from Theodore E James, to Messrs Harrison & Sons | 29 January 1900 |
| NLB/19/504 | Copy letter from A L K, to Messrs Harrison & Sons | 18 October 1899 |
| NLB/16/175 | Copy letter from Robert William Frederick Harrison, to John Hopkinson, The Grange, St Albans | 15 February 1898 |
| NLB/19/497 | Copy letter from an unknown correspondent, to Messrs Harrison & Sons | 16 October 1899 |
| NLB/27/528 | Copy letter from Robert William Frederick Harrison, to Clement Reid, Fellow of the Royal Society | 15 October 1903 |
| NLB/42/458 | Copy letter from Robert William Frederick Harrison to Clement Reid FRS, Geological Museum, SW | 16 June 1910 |
| NLB/42/488 | Copy letter from Robert William Frederick Harrison to Clement Reid FRS | 21 June 1910 |
| NLB/46/635 | Copy letter from Henry George Lyons, to Dr Charles William Andrews, Alfred Harker, Dr George Jennings Hinde, Clement Reid, Professor Albert Charles Seward, Professor William Whitehead Watts, Captain Thomas Henry Tizard, Professor John Walter Gregory | 7 October 1912 |
| NLB/47/799 | Copy letter from Robert William Frederick Harrison to Clement Reid FRS | 15 April 1913 |
| NLB/50/403 | Copy letter from Robert William Frederick Harrison, to Clement Reid, [Fellow of the Royal Society] | 3 July 1914 |
| NLB/50/49 | Copy letter from Robert William Frederick Harrison, to Clement Reid, Fellow of the Royal Society | 22 April 1914 |
| NLB/54/109 | Copy letter from Joseph John Thomson, President of the Royal Society; to Mrs Reid, [Wife of Mr. Clement Reid, FRS] | 6 February 1917 |
| NLB/54/89 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Professor [Albert Charles] Seward, FRS | 5 February 1917 |
| RR/18/69 | Referee's report by Horace Bolingbroke Woodward, on a paper 'The lignite of bovey tracey' by Clement Reid and Eleanor Reid | 3 June 1910 |
| RR/18/70 | Referee's report by Albert Charles Seward, on a paper 'The lignite of bovey tracey' by Clement Reid and Eleanor Reid | 7 June 1910 |
| NLB/65/752 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to J. Groves Esq.; Trevarthian, Freshwater Bay, Isle of Wight | 18 December 1923 |
| NLB/34/755 | Copy letter from Archibald Geikie, to Professor Herbert Hall Turner, Fellow of the Royal Society | 5 March 1907 |
| MC/28/224 | Letter from Clement Reid, Once Acre, Milford on Sea, Hants, to The Assistant Secretary, Royal Society | 31 December 1913 |
| RR/23/80 | Referee's report by Dukinfield Henry Scott, on a paper 'Preliminary report on the Purbeck characeae' by Clement Reid and J Groves | 5 February 1916 |
| MC/17 | Volume 17 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1897-1899 |
| MC/25/197 | Letter from Clement Reid, 54 Yale Court, Honeybourne [Road], to Mr [Robert] Harrison, [Royal Society] | 23 June 1910 |
| NLB/47/270 | Copy letter from Robert William Frederick Harrison to Clement Reid FRS | 7 January 1913 |
| MC/32/132 | Letter from [William Abbott] Herdman, The University of Liverpool, to Mr [Robert] Harrison, [Royal Society] | 16 February 1917 |
| MC/32/239 | Letter from [Albert Charles] Seward, Botany School, Cambridge, to [Robert] Harrison, [Royal Society] | 7 February 1917 |