| RefNo | Title | Date |
| EC/1913/03 | Chapman, David Leonard: certificate of election to the Royal Society | |
| IM/000798 | Chapman, David Leonard | nd |
| NLB/51/519 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society to David Leonard Chapman FRS | 15 April 1915 |
| RR/43/141 | Referee's report by David Leonard Chapman, on a paper 'The photosensitised explosion of hydrogen and oxygen by chlorine' by Ronald George Wreyford Norrish | December 1931 |
| RR/30/25 | Referee's report by Harold Baily Dixon, on a paper 'The union of hydrogen and oxygen in presence of silver and gold' by David Leonard Chapman, J E Ramsbottom and C G Trotman | [October 1924] |
| RR/35/117 | Referee's report by David Leonard Chapman, on a paper 'The relative stability of nitrous oxide and ammonia in electric discharge' by William Kenneth Hutchison and Cyril Norman Hinshelwood | September 1927 |
| RR/42/45 | Referee's report by David Leonard Chapman, on a paper 'The uniform propagation of flames' by N R Sen and H K Sen | September 1930 |
| RR/49/75 | Referee's report by David Leonard Chapman, on a paper 'The volume coefficients of expansion of several gases at pressures below one metre' by J B M Coppock and Robert Whytlaw-Gray | [October 1933] |
| RR/48/128 | Referee's report by David Leonard Chapman, on a paper 'The photochemistry of phosphine' by Harry Work Melville | [August 1932] |
| RR/50/76 | Referee's report by David Leonard Chapman, on a paper 'The photosynthesis of hydrogen chloride. III.—Mixtures containing oxygen' by Ronald George Wreyford Norrish and Mowbray Ritchie | April 1933 |
| RR/52/33 | Referee's report by David Leonard Chapman, on a paper 'The interaction of hydrogen with micro-crystalline charcoal II—activated sorption of hydrogen and methane by carbon' by Richard Maling Barrer | January 1925 |
| RR/53/7 | Referee's report by David Leonard Chapman, on a paper 'The constitution and formation of bleaching powder' by Charles William Bunn, L M Clark and I L Clifford | [March 1935] |
| NLB/67/497 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to [David Leonard] Chapman Esq., FRS | 10 January 1925 |
| RR/66/263 | Referee's report by David Leonard Chapman, on a paper 'Distribution of charge and potential in an electrolyte bounded by two plane infinite parallel plates' by A J Corkill and Louis Rosenhead | [May 1939] |
| RR/46/78 | Referee's report by David Leonard Chapman, on a paper 'The photosynthesis of hydrogen chloride. II. —“Oxygen free” mixtures' by Mowbray Ritchie and Ronald George Wreyford Norrish | [November 1932] |
| NLB/67/101 | Copy letter from James Hopwood Jeans, Secretary of the Royal Society; to Professor [Arthur William] Crossley, FRS | 21 October 1924 |
| RR/34/118 | Referee's report by David Leonard Chapman, on a paper 'The mechanism of activation at catalytic surfaces' by Hugh Stott Taylor | [August 1926] |
| RR/21/109 | Referee's report by David Leonard Chapman, on a paper 'The silver voltameter. Part III. The solvent properties of silver nitrate solutions' by Thomas Martin Lowry | [August 1914] |
| RR/39/48 | Referee's report by Arthur Lapworth, on a paper 'A study of the catalysis by silver of the union of hydrogen and oxygen' by David Leonard Chapman and W K Hall | [May 1929] |
| RR/41/92 | Referee's report by David Leonard Chapman, on a paper 'The kinetics of the oxidation of gaseous benzene' by R Fort and Cyril Norman Hinshelwood | July 1930 |
| RR/43/44 | Referee's report by David Leonard Chapman, on a paper 'The photosensitised decomposition of nitrogen trichloride. Part II.— The effects of surface and inert gases, and the mechanism of reaction' by J G A Griffiths and Ronald George Wreyford Norrish | October 1931 |
| RR/43/112 | Referee's report by David Leonard Chapman, on a paper 'The oxidation of phosphorus vapour at low pressures in presence of platinum and tungsten' by Harry Work Melville and E B Ludlam | December 1931 |
| RR/46/77 | Referee's report by David Leonard Chapman, on a paper 'The photosynthesis of hydrogen chloride. I.—A new experimental method; the inhibiting effect of hydrogen chloride' by Mowbray Ritchie and Ronald George Wreyford Norrish | [November 1932] |
| RR/48/129 | Second referee's report by David Leonard Chapman, on a paper 'The photochemistry of phosphine' by Harry Work Melville | [November 1932] |
| RR/53/20 | Referee's report by Gilbert Thomas Morgan, on a paper 'The catalysis by palladium of the union of hydrogen and oxygen' by David Leonard Chapman and G Gregory | 21 July 1934 |
| RR/59/21 | Referee's report by Gilbert Thomas Morgan, on a paper 'The catalytic combination of hydrogen and oxygen at the surface of platinum' by David Leonard Chapman and Peter William Reynolds | 18 May 1936 |
| RR/68/126 | Referee's report by David Leonard Chapman, on a paper 'The photocombination of hydrogen and chlorine in oxygen-free systems' by M Ritchie and D Taylor | [1941] |