| Reference number | Title | Date |
| NLB/17/70 | Copy letter from Robert William Frederick Harrison, to the Honorary Secretaries of the Linnean Society | 12 July 1898 |
| NLB/5/498 | Copy letter from Herbert Rix, to Dr Woodward, Fellow of the Royal Society | 30 June 1891 |
| NLB/7/801 | Copy letter from Herbert Rix, to Dr Woodward, Fellow of the Royal Society | [28 April 1893] |
| NLB/8/368 | Copy letter from Herbert Rix, to Mr H Gronwald, Natural History Museum, South Kensington, S.W. | 10 October 1893 |
| NLB/15/82 | Copy letter from Robert William Frederick Harrison, to Messrs West, Newman and Company | 19 June 1897 |
| RR/15/89 | Referee's report by Harry Govier Seeley, on a paper 'Extinct mammalia from Madagascar. I. Megaladapis insignis sp. n.' by Charles Immanuel Forsyth Major | 13 March 1900 |
| RR/15/90 | Referee's report by Thomas George Bond Howes, on a paper 'Extinct Mammalia from Madagascar. I. Megaladapis insignis sp. n.' by Charles Immanuel Forsyth Major | 16 March 1900 |
| NLB/14/600 | Copy letter from Robert William Frederick Harrison, to Dr Henry Woodward, Fellow of the Royal Society | 6 April 1897 |
| NLB/14/653 | Copy letter from Robert William Frederick Harrison, to Dr Henry Woodward, Fellow of the Royal Society | 14 April 1897 |
| NLB/14/642 | Copy letter from Robert William Frederick Harrison, to Dr Henry Woodward, Fellow of the Royal Society | 13 April 1897 |
| NLB/14/848 | Copy letter from Robert William Frederick Harrison, to Professor Edwin Ray Lankester, Fellow of the Royal Society | 28 May 1897 |
| NLB/15/2 | Copy letter from Robert William Frederick Harrison, to Dr Henry Woodward, Fellow of the Royal Society | 4 June 1897 |
| NLB/15/310 | Copy letter from Robert William Frederick Harrison, to Messrs West Newman & Company | 4 August 1897 |
| NLB/20/316 | Copy letter from Robert William Frederick Harrison, to Dr Charles Immanuel Forsyth Major, British Museum (Natural History), Cromwell Road, S.W. | 20 March 1900 |
| NLB/16/656 | Copy letter from Robert William Frederick Harrison, to Sir W H Flower, Fellow of the Royal Society, British Museum (Natural History), Cromwell Road, S.W. | 17 May 1898 |
| NLB/17/115 | Copy letter from Robert William Frederick Harrison, to the Treasurer of the Linnean Society, Burlington House | 20 July 1898 |
| NLB/18/84 | Copy letter from Arthur William Rucker, to [Professor A R] Forsyth | 10 January 1899 |
| NLB/20/348 | Copy letter from Robert William Frederick Harrison, to Dr Charles Immanuel Forsyth Major, [Fellow of the Royal Society] | 30 March 1900 |
| NLB/20/344 | Copy letter from Robert William Frederick Harrison, to Dr Charles Immanuel Forsyth Major, [Fellow of the Royal Society], British Museum (Natural History), Cromwell Road, S.W. | 28 March 1900 |
| NLB/20/281 | Copy letter from Robert William Frederick Harrison, to Professor William Abbott Herdman, Fellow of the Royal Society | 12 March 1900 |
| NLB/20/307 | Copy letter from Robert William Frederick Harrison, to Sir Michael Foster, Secretary, Royal Society | 17 March 1900 |
| NLB/20/310 | Copy letter from Robert William Frederick Harrison, to Adam Sedgwick, Fellow of the Royal Society | 20 March 1900 |
| NLB/20/291 | Copy letter from Robert William Frederick Harrison, to Sir Michael Foster, Secretary, Royal Society | 13 March 1900 |
| NLB/20/321 | Copy letter from Robert William Frederick Harrison, to Adam Sedgwick, Fellow of the Royal Society | 22 March 1900 |
| NLB/20/665 | Copy letter from Arthur William Rucker, to Dr Charles Immanuel Forsyth Major, [Fellow of the Royal Society], British Museum (Natural History), Cromwell Road, S.W. | 14 June 1900 |
| NLB/21/121 | Copy letter from Theodore E James, to Dr Henry Woodward, Fellow of the Royal Society | 1 August 1900 |
| NLB/23/1/281 | Copy letter from Robert William Frederick Harrison, to Professor Andrew Russell Forsyth, Fellow of the Royal Society | 21 October 1901 |
| NLB/37/871 | Copy Letter from Robert William Frederick Harrison to W [William] Barlow, Fellow of the Royal Society | 26 May 1908 |
| NLB/47/333 | Copy letter from Robert William Frederick Harrison to Dr C [Charles] I [Immanuel] Forsyth Major FRS, c/o A C Southwell, Bastia, Corsica | 17 January 1913 |
| RR/11/252 | Referee's report by Edwin Tulley Newton, on a paper 'On Megaladapis madagascariensis, an extinct gigantic lemuroid from Madagascar; with remarks on the associated fauna, and on its geological age' by Charles Immanuel Forsyth Major | 14 July 1893 |
| NLB/64/405 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to O. A. Forsyth-Major Esquire; Connaught Club, Mable Arch, W. | 9 April 1923 |
| EC/1908/12 | Major, Charles Immanuel Forsyth: certificate of election to the Royal Society | |
| NLB/10/606 | Copy letter from Herbert Rix, to Dr Henry Woodward, Fellow of the Royal Society | 2 January 1895 |
| NLB/15/300 | Copy letter from Theodore E James, to Messrs West Newman & Company | 4 August 1897 |
| NLB/15/289 | Copy letter from Robert William Frederick Harrison, to Dr Woodward | 29 July 1897 |
| NLB/20/263 | Copy letter from Robert William Frederick Harrison, to Dr Henry Woodward, Fellow of the Royal Society, British Museum (Natural History), Cromwell Road, S.W. | 8 March 1900 |
| NLB/20/453 | Copy letter from Robert William Frederick Harrison, to Dr Charles Immanuel Forsyth Major, [Fellow of the Royal Society] | 27 April 1900 |
| RR/11/253 | Referee's report by William Thomas Blanford, on a paper 'On Megaladapis madagascariensis, an extinct gigantic lemuroid from Madagascar; with remarks on the associated fauna, and on its geological age' by Charles Immanuel Forsyth Major | 18 July 1893 |
| RR/15/91 | Referee's report by Edwin Ray Lankester, on a paper 'Extinct mammalia from Madagascar. I. Megaladapis insignis sp. n.' by Charles Immanuel Forsyth Major | March 1900 |