| Reference number | Title | Date |
| EC/1898/03 | Baker, Henry Frederick: certificate of election to the Royal Society | |
| IM/GA/Russell/0 | Baker, Henry Frederick | nd |
| RR/16/71 | Letter from Robert William Frederick Harrison, on a paper 'A generaliziation of the functions xn and gamma (n)' by Reverend F H Jackson to Frederick Henry Baker | 16 April 1904 |
| RR/16/245 | Referee's report by Henry Frederick Baker, on a paper 'The general theory of integration' by Dr William Henry Young | 2 December 1904 |
| RR/35/28 | Referee's report by Henry Frederick Baker, on a paper 'Commentative ordinary differential operations' by J L Burchnell and T W Chaundy | February 1927 |
| RR/17/199 | Referee's report by Henry Frederick Baker, on a paper 'Preliminary note on the operational invariants of a binary quantic' by Percy Alexander MacMahon | [November 1907] |
| NLB/16/596 | Copy letter of a notice from Robert William Frederick Harrison, to [The Times] | 5 May 1898 |
| NLB/23/2/209 | Copy letter from Sir Michael Foster, to Dr Henry Frederick Baker, Fellow of the Royal Society | 3 June 1902 |
| NLB/23/1/717 | Copy letter from Robert William Frederick Harrison, to Henry Frederick Baker, Fellow of the Royal Society | 9 January 1902 |
| NLB/29/283 | Copy letter from Theodore E James, to Dr Henry Frederick Baker, Fellow of the Royal Society | 2 September 1904 |
| NLB/30/121 | Copy letter from Robert William Frederick Harrison, to Dr Henry Frederick Baker, Fellow of the Royal Society | 31 January 1905 |
| NLB/30/283 | Copy letter from Robert William Frederick Harrison, to Dr Henry Frederick Baker, Fellow of the Royal Society | 24 February 1905 |
| NLB/28/598 | Copy letter from Robert William Frederick Harrison, to Dr Henry Frederick Baker, Fellow of the Royal Society | 16 April 1904 |
| NLB/28/662 | Copy letter from Robert William Frederick Harrison, to Henry Frederick Baker, Fellow of the Royal Society | 28 April 1904 |
| NLB/36/157 | Copy letter from Robert William Frederick Harrison, to Dr Henry Frederick Baker, Fellow of the Royal Society | 27 August 1907 |
| NLB/36/209 | Copy letter from Robert William Frederick Harrison, to Dr Henry Frederick Baker, Fellow of the Royal Society | 18 September 1907 |
| NLB/37/716 | Copy letter from Robert William Frederick Harrison to Dr H [Henry] F [Frederick] Baker, Fellow of the Royal Society | 4 May 1908 |
| NLB/46/78 | Copy letter from Robert William Frederick Harrison, to Dr [Henry Frederick] Baker, Fellow of the Royal Society | 6 June 1912 |
| NLB/38/478 | Copy letter from Robert William Frederick Harrison, to Dr Henry Frederick Baker, Fellow of the Royal Society | 10 August 1908 |
| NLB/43/109 | Copy letter from Joseph Larmor, to Dr Henry Frederick Baker, Fellow of the Royal Society | 7 November 1910 |
| NLB/38/542 | Copy letter from Joseph Larmor and Sir Archibald Geikie, to Henry Frederick Baker, Fellow of the Royal Society, and others | 16 September 1908 |
| NLB/43/309 | Copy letter from Robert William Frederick Harrison, to Dr [Henry Frederick] Baker, Fellow of the Royal Society | 8 December 1910 |
| NLB/44/465 | Copy letter from Robert William Frederick Harrison to Dr H [Henry] F [Frederick] Baker FRS | 14 July 1911 |
| NLB/45/768 | Copy letter from Robert William Frederick Harrison to Dr H [Henry] F [Frederick] Baker FRS | 4 May 1912 |
| NLB/47/770 | Copy letter from Robert William Frederick Harrison to Dr H [Henry] F [Frederick] Baker FRS, the Mathematics Committee | 10 April 1913 |
| NLB/52/156 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Professor Henry Frederick Baker, FRS | 28 September 1915 |
| RR/16/240 | Referee's report by Henry Frederick Baker, on a paper 'The convergence of infinite series of analytic functions' by H A Webb | February 1905 |
| RR/16/241 | Referee's report by Henry Frederick Baker and Ernest William Hobson, on a paper 'The convergence of infinite series of analytic functions' by H A Webb | 16 March 1905 |
| RR/17/62 | Referee's report by Henry Frederick Baker, on a paper 'Second memoir on the compositions of numbers' by Percy Alexander MacMahon | [October 1906] |
| RR/22/11 | Referee's report by Edmund Taylor Whittaker, on a paper 'On certain linear differential equations of astronomical interest' by Henry Frederick Baker | June 1915 |
| RR/35/29 | Second referee's report by Henry Frederick Baker, on a paper 'Commentative ordinary differential operations' by J L Burchnell and T W Chaundy | January 1928 |
| RR/33/28 | Referee's report by Henry Frederick Baker, on a paper 'Periodic orbits of the second genus near the straight-line equilibrium points in the problem of three bodies' by Daniel Buchanan | December 1926 |
| NLB/58/827 | Copy letter from James Hopwood Jeans, Secretary of the Royal Society; to Professor [Henry Frederick] Baker, FRS | 23 June 1920 |
| RR/22/4 | Referee's report by Alfred Cardew Dixon, on a paper 'On certain linear differential equations of astronomical interest' by Henry Frederick Baker | August 1915 |
| NLB/68/95 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Professor [Henry Frederick] Baker, FRS | 9 May 1925 |
| NLB/67/858 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Professor [Henry Frederick] Baker, FRS | 27 March 1925 |
| NLB/70/99 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Professor [Henry Frederick] Baker, FRS | 4 January 1927 |
| NLB/71/587 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to the President, Organization Committee of the International Congress of Mathematicians, Bologna [Italy] | 13 July 1928 |
| NLB/72/760 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Professor [Henry Frederick] Baker, FRS | 7 April 1930 |
| NLB/72/759 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Professor [Henry Frederick] Baker, FRS | 4 April 1930 |
| IM/Maull/000195 | Baker, Henry Frederick | nd |
| NLB/22/650 | Copy letter from Robert William Frederick Harrison, to [Henry Frederick] Baker, Fellow of the Royal Society | 20 June 1901 |
| NLB/33/716 | Copy letter from Robert William Frederick Harrison, to; Augustus Desire Waller, Lord Avebury [John Lubbock], Sir Benjamin Baker, Dr Henry Frederick Baker, Professor David Ferrier, Professor Sydney John Hickson, Dr A Scott, Mr Albert Charles Seward, Professor William Johnson Sollas, and Professor Silvanus Phillips Thompson, Fellows of the Royal Society | 26 October 1906 |
| RR/19/48 | Referee's report by Henry Frederick Baker, on a paper 'On the foundations of the theory of algebraic functions of one variable' by John Charles Fields | [July 1912] |
| RR/50/68 | Referee's report by Henry Frederick Baker, on a paper 'The kelvin-poincare problem of stellar evolution' by V V Narlikar | May 1933 |
| RR/15/153 | Referee's report by Henry Frederick Baker, on a paper 'A memoir on integral functions' by Ernest William Barnes | 1 February 1902 |
| AP/79/13/1 | Unpublished manuscript, 'On discontinuous fluid motion' by J G [John Gaston] Leathem | 1917 |
| NLB/66/720 | Copy letter from James Hopwood Jeans, Secretary of the Royal Society; to Prof. [Sydney] Chapman | 25 June 1924 |
| NLB/52 | New Letter Book volume 52, copy letters sent from Royal Society administration | 9 July 1915-8 March 1916 |
| RR/16/72 | Referee's report by Henry Frederick Baker, on a paper 'A generaliziation of the functions xn and gamma (n)' by Reverend F H Jackson | 25 May 1904 |
| RR/40/19 | Referee's report by Henry Frederick Baker, on a paper 'The arithmetically reduced indefinite quadratic form in n-variables' by Louis Joel Mordell | December 1930 |
| AP/79/13 | Unpublished paper, 'On discontinuous fluid motion' by J G [John Gaston] Leathem | 1917 |
| RR/16/54 | Referee's report by Henry Frederick Baker, on a paper 'The differential invariants of space' by Andrew Russell Forsyth | August 1903 |
| RR/15/6 | Referee's report by Henry Frederick Baker, on a paper 'The theory of the double gamma function' by Ernest William Barnes | 5 May 1900 |
| RR/15/76 | Referee's report by Henry Frederick Baker, on a paper 'Uber reihen auf der convergenzgrenze' by Emanuel Lasker | June 1900 |
| RR/41/37 | Referee's report by Henry Frederick Baker, on a paper 'Commutative ordinary differential operators. II.—The identity Pn = Qm' by J L Burchnall and T W Chaundy | 23 June 1930 |