| RefNo | Title | Date |
| EC/1889/09 | Fletcher, Sir Lazarus: certificate of election to the Royal Society | |
| IM/001448 | Fletcher, Sir Lazarus | nd |
| NLB/23/1/120 | Copy letter from Robert William Frederick Harrison, to Mr Fletcher | 26 September 1901 |
| NLB/7/297 | Copy letter from Herbert Rix, to Lazarus Fletcher, Fellow of the Royal Society, British Museum (Natural History), Cromwell Road, S.W. | 13 January 1893 |
| NLB/14/685 | Copy letter from Robert William Frederick Harrison, to Lazarus Fletcher, Fellow of the Royal Society | 28 April 1897 |
| RR/16/85 | Referee's report by Lazarus Fletcher, on a paper 'An enquiry into the variation of angles observed in crystal; especially of Potassium-Alum and Ammonium-Alum' by Henry Alexander Miers | 11 April 1903 |
| NLB/19/32 | Copy letter from Robert William Frederick Harrison, to Lazarus Fletcher, Fellow of the Royal Society | 6 June 1899 |
| NLB/23/1/253 | Copy letter from Robert William Frederick Harrison, to Lazarus Fletcher, Fellow of the Royal Society | 16 October 1901 |
| NLB/23/1/338 | Copy letter from Robert William Frederick Harrison, to Lazarus Fletcher, Fellow of the Royal Society | 27 October 1901 |
| NLB/28/75 | Copy letter from Robert William Frederick Harrison, to Lazarus Fletcher, Fellow of the Royal Society, 35 Woodville Gardens, Ealing, W | 5 January 1904 |
| NLB/32/97 | Copy letter from Robert William Frederick Harrison, to [Messrs Harrison & Sons] | 3 January 1906 |
| NLB/47/811 | Copy letter from Robert William Frederick Harrison to Mr [Lazarus] Fletcher FRS | 16 April 1913 |
| NLB/35/135 | Copy letter from Robert William Frederick Harrison, to Messrs Harrison & Sons | 22 April 1907 |
| NLB/38/530 | Copy letter from Robert William Frederick Harrison, to Lazarus Fletcher, Fellow of the Royal Society | 7 September 1908 |
| NLB/40/511 | Copy letter from Robert William Frederick Harrison to L [Lazarus] Fletcher FRS | 18 June 1909 |
| NLB/43/44/8 | Copy letter from Robert William Frederick Harrison, to Lazarus Fletcher, Fellow of the Royal Society | 27 October 1910 |
| NLB/45/211 | Copy letter from Robert William Frederick Harrison to L [Lazarus] Fletcher FRS | 19 January 1912 |
| NLB/46/295 | Copy letter from Robert William Frederick Harrison, to Lazarus Fletcher, Fellow of the Royal Society | 8 July 1912 |
| NLB/45/812 | Copy letter from Robert William Frederick Harrison to Dr L [Lazarus] Fletcher FRS | 14 May 1912 |
| NLB/47/783 | Copy letter from Robert William Frederick Harrison to L [Lazarus] Fletcher FRS, 35 Woodville Gardens, Ealing | 14 April 1913 |
| NLB/57/69 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to unknown correspondent | 10 July 1919 |
| NLB/48/785 | Copy letter from Robert William Frederick Harrison, to [Lazarus] Fletcher, Fellow of the Royal Society | 14 October 1913 |
| NLB/54/15 | Copy letter from an unknown sender; to Sir Lazarus Fletcher, FRS | 20 January 1917 |
| NLB/52/537 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Messrs Harrison & Sons | 10 January 1916 |
| NLB/54/116 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Sir Lazarus Fletcher, FRS | 12 February 1917 |
| RR/20/115 | Referee's report by Lazarus Fletcher, on a paper 'On a meteoric iron from winburg, orange free state' by W A Douglas Rudge | 29 May 1913 |
| RR/13/100 | Referee's report by Lazarus Fletcher, on a paper 'Angular measurement of optic axial emergences' by William Jackson Pope | 15 May 1896 |
| RR/12/127 | Referee's report by Lazarus Fletcher, on a paper 'On hollow pyramidal ice crystals' by Karl Grossmann and Joseph Lomas | 24 January 1894 |
| NLB/57/284 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to unknown correspondent | 7 October 1919 |
| NLB/60/345 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Dr. [Archibald] Liversidge, FRS | 21 January 1921 |
| NLB/57/32 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; Sir Lazarus Fletcher, FRS | 4 July 1919 |
| NLB/10/38 | Copy letter from Theodore E James, to Lazarus Fletcher, Fellow of the Royal Society, 26 Woodville Road, Ealing, W. | 8 September 1894 |
| NLB/9/251 | Copy letter from Herbert Rix, to Lazarus Fletcher, Fellow of the Royal Society | 23 April 1894 |
| NLB/37/734 | Copy letter from Robert William Frederick Harrison to Dr Johnston-Levis, 82 Rue de Courcelles, Paris | 6 May 1908 |
| NLB/54 | New Letter Book volume 54, copy letters sent from Royal Society administration | 10 January 1917-2 November 1917 |
| RR/12/106 | Referee's report by William Augustus Tilden, on a paper 'Chemical analysis of the meteoric stone found at Makariwa, near Invercargill, New Zealand, in the year 1886' by Lazarus Fletcher | 26 January 1894 |
| NLB/57 | New Letter Book volume 57, copy letters sent from Royal Society administration | 27 June 1919-27 February 1920 |
| RR/14/99 | Referee's report by Lazarus Fletcher, on a paper 'A compensated interference dilatometer' by Alfred Edwin Howard Tutton | 19 March 1898 |
| AP/70/2 | Unpublished paper, 'Chemical analysis of the meteoric stone found at Makariwa [Makarewa], near Invercargill, New Zealand in the year 1886' by Lazarus Fletcher | 1893 |
| RR/12/201 | Referee's report by Lazarus Fletcher, on a paper 'On the microscopical characters of urinary calculi of oxalate and lime' by William Miller Ord and Samuel George Shattock | 22 September 1894 |
| RR/12/48 | Referee's report by Lazarus Fletcher, on a paper 'On a meteoric stone found at Makariwa, near Invercargill, New Zealand' by George Henry Frederick Ulrich | 24 January 1893 |
| RR/12/107 | Referee's report by Mervyn Herbert Nevil Story Maskelyne, on a paper 'Chemical analysis of the meteoric stone found at Makariwa, near Invercargill, New Zealand, in the year 1886' by Lazarus Fletcher | nd [1893] |
| RR/12/108 | Letter from Lazarus Fletcher, to John William Strutt, 3rd Baron Rayleigh, regarding a paper 'Chemical analysis of the meteoric stone found at Makariwa, near Invercargill, New Zealand, in the year 1886' by Lazarus Fletcher | 28 February 1894 |
| RR/15/2 | Referee's report by Lazarus Fletcher, on a paper 'An experimental investigation into the flow of marble' by Frank Dawson Adams and John Thomas Nicolson | 26 July 1900 |
| RR/15/56 | Referee's report by Lazarus Fletcher, on a paper 'The mineral constituents of dust and soot from various sources' by Walter Noel Hartley and Hugh Ramage | December 1900 |
| RR/15/265 | Referee's report by Lazarus Fletcher, on a paper 'A comparative crystallographical study of the double selenates of the series R2M(SeO4)2, 6H2O - salts in which M is magnesium' by Alfred Edward Howard Tutton | 22 May 1901 |