| Reference number | Title | Date |
| EC/1874/08 | Henrici, Olaus Magnus Friedrich Erdmann: certificate of election to the Royal Society | |
| IM/Maull/002040 | Henrici, Olaus Magnus Friedrich Erdmann | nd |
| RR/15/95 | Referee's report by Olaus Magnus Friedrich Erdmann Henrici, on a paper 'Mathematical contributions to the theory of evolution VIII. On the correlation of characters not quantitatively measurable' by Karl Pearson | 3 March 1900 |
| NLB/1/661 | Copy letter from Herbert Rix, to Professor Olaus Magnus Friedrich Erdmann Henrici, Fellow of the Royal Society | 27 October 1887 |
| NLB/8/1103 | Copy letter from Herbert Rix, to Professor Olaus Magnus Friedrich Erdmann Henrici, Fellow of the Royal Society, 34 Clarendon Road, Notting Hill, W. | 24 February 1894 |
| NLB/11/474 | Copy letter from Herbert Rix, to Professor Olaus Magnus Friedrich Erdmann Henrici, Fellow of the Royal Society | 10 July 1895 |
| NLB/17/62 | Copy letter from Theodore E James, to Professor Olaus Magnus Friedrich Erdmann Henrici, Fellow of the Royal Society | 9 July 1898 |
| RR/15/139 | Referee's report by Olaus Magnus Friedrich Erdmann Henrici, on a paper 'The association of attributes in statistics, with examples from the material of the Childhood Society, etc' on a paper by George Udny Yule | 8 January 1900 |
| RR/15/357 | Referee's report by Olaus Magnus Friedrich Erdmann Henrici, on a paper 'Quaternions and projective geometry' by Charles Jasper Joly | December 1902 |
| NLB/14/707 | Copy letter from Robert William Frederick Harrison, to Dr Joseph Larmor, Professor Olaus Magnus Friedrich Erdmann Henrici, Professor Andrew Russell Forsyth, Professor Walter Elliot Elliot, Dr Ernest William Hobson, Fellows of the Royal Society | 28 April 1897 |
| RR/15/138 | Referee's report by Walter Frank Raphael Weldon, on a paper 'The association of attributes in statistics, with examples from the material of the Childhood Society, etc' on a paper by George Udny Yule | December 1899 |
| NLB/15/91 | Copy letter from Arthur William Rucker, to Professor Olaus Magnus Friedrich Erdmann Henrici, [Fellow of the Royal Society] | 25 June 1897 |
| NLB/16/103 | Copy letter from Arthur William Rucker, to [R T] Glazebrook | 31 January 1898 |
| NLB/17/122 | Copy letter from Robert William Frederick Harrison, to Professor George Howard Darwin | 20 July 1898 |
| NLB/20/213 | Copy letter from Robert William Frederick Harrison, to Professor Olaus Magnus Friedrich Erdmann Henrici, [Fellow of the Royal Society] | 26 February 1900 |
| NLB/25/218 | Copy letter from Joseph Larmor, to Professor Olaus Magnus Friedrich Erdmann Henrici, [Fellow of the Royal Society] | 23 September 1902 |
| NLB/46/207 | Copy letter from Robert William Frederick Harrison, to Professor [Olaus Magnus Friedrich Erdmann] Henrici, Fellow of the Royal Society | 25 June 1912 |
| NLB/56/16 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Professor [Andrew Russell] Forsyth, FRS | 4 November 1918 |
| RR/9/374 | Referee's report by Olaus Magnus Friedrich Erdmann Henrici, on a paper 'On systems of circles and spheres' by R Lachlan | 25 April 1886 |
| RR/9/373 | Letter from Olaus Magnus Friedrich Erdmann Henrici, on a paper 'On systems of circles and spheres' by R Lachlan to the Secretary of the Royal Society | 19 April 1886 |
| RR/10/103 | Referee's report by Olaus Magnus Friedrich Erdmann Henrici, on a paper 'On the diameters of a plane cubic' by John James Walker | 29 October 1887 |
| RR/13/228 | Letter from Arthur William Rucker, on a paper 'A Maya calendar inscription, interpreted by Goodman's tables' by Alfred Percival Maudslay to Henrici | 25 June 1897 |
| RR/12/330 | Second referee's report by Olaus Magnus Friedrich Erdmann Henrici, on a paper 'The kinematics of machines' by T A Hearson | 15 July 1895 |
| RR/12/328 | Referee's report by Olaus Magnus Friedrich Erdmann Henrici, on a paper 'The kinematics of machines' by T A Hearson | 3 April 1895 |
| RR/13/270 | Letter from Robert Harrison, Assistant Secretary of the Royal Society, on a paper 'On the geometrical treatment of the 'normal curve' of statistics, with especial reference to correlation and to the theory of error' by W F Sheppard to Olaus Magnus Friedrich Erdmann Henrici | 26 January 1898 |
| RR/13/268 | Referee's report by Olaus Magnus Friedrich Erdmann Henrici, on a paper 'On the geometrical treatment of the 'normal curve' of statistics, with especial reference to correlation and to the theory of error' by W F Sheppard | 1897 |
| RR/13/66 | Referee's report by Olaus Magnus Friedrich Erdmann Henrici, on a paper 'Octonions' by Alex McAulay | 1896 |
| RR/13/252 | Referee's report by Olaus Magnus Friedrich Erdmann Henrici, on a paper 'Mathematical contributions to the theory of evolution.— IV. On the probable errors of frequency constants and on the influence of random selection on variation and correlation' by Karl Pearson and Louis Napoleon George Filon | 12 February 1898 |
| NLB/13/735 | Copy letter from Robert William Frederick Harrison, to H J Falk, The Athenaeum, Liverpool | 12 November 1896 |
| NLB/16/77 | Copy letter from Robert William Frederick Harrison, to Professor Henrici, Fellow of the Royal Society | 26 January 1898 |
| RR/9/217 | Referee's report by Olaus Magnus Friedrich Erdmann Henrici, on a paper 'On the dynamics of a rigid body in elliptic space' by R S Heath | 8 April 1884 |
| NLB/16/74 | Copy letter from Robert William Frederick Harrison, to Professor Henrici, Fellow of the Royal Society | 26 January 1898 |
| RR/10/105 | Second referee's report by Olaus Magnus Friedrich Erdmann Henrici, on a paper 'On the diameters of a plane cubic' by John James Walker | 24 November 1887 |
| RR/8/84 | Referee's report by Olaus Magnus Friedrich Erdmann Henrici, on a paper 'On the classification of Loci' by William Kingdon Clifford | 29th June 1878 |
| RR/13/251 | Letter from Robert Harrison, Assistant Secretary of the Royal Society on a paper 'Mathematical contributions to the theory of evolution.— IV. On the probable errors of frequency constants and on the influence of random selection on variation and correlation' by Karl Pearson and Louis Napoleon George Filon to Olaus Magnus Friedrich Erdmann Henrici | 26 January 1898 |
| MC/10/385 | Letter from O [Olaus] Henrici, University College, to [William] Spottiswoode, [Treasurer of the Royal Society] | 25 April 1876 |
| MC/10 | Volume 10 of miscellaneous correspondence regarding business matters, sent to the Royal Society | July 1873-1876 |
| AP/77/1 | Unpublished paper, 'On the influence of bias and of personal equation in statistics of ill-defined qualities: An experimental study' by George Udny Yule | 1905 |
| RR/11/236 | Letter from Olaus Magnus Friedrich Erdmann Henrici, on a paper 'On the three-bar motion of watt' by William Brennand to the Secretary of the Royal Society | 26 May 1893 |
| RR/11/236bis | Referee's report by Olaus Magnus Friedrich Erdmann Henrici, on a paper 'On the three-bar motion of watt' by William Brennand | 1 January 1894 |
| RR/12/45 | Referee's report by Olaus Magnus Friedrich Erdmann Henrici, on a paper 'On a graphical representation of the twenty-seven lines on a cubic surface' by Henry Martyn Taylor | [1893] |
| RR/13/67 | Letter from Olaus Magnus Friedrich Erdmann Henrici, on a paper 'Octonions' by Alex McAulay to the Secretary of the Royal Society | 4 February 1896 |
| RR/13/70 | Letter from Olaus Magnus Friedrich Erdmann Henrici, on a paper 'Octonions' by Alex McAulay to George Howard Darwin | 4 March 1896 |
| RR/13/227 | Letter from George Howard Darwin, on behalf of the Committee, on a paper 'A Maya calendar inscription, interpreted by Goodman's tables' by Alfred Percival Maudslay to the Secretary of the Royal Society | June 1897 |
| MC/33/165 | Letter from [William Cawthorne] Unwin, Palace Gate Mansions, 29 Palace Gate, Kensington, W., to Mr [Robert] Harrison, [Royal Society] | 16 November 1918 |
| MC/33/84 | Letter from Helen [Stodart] Henrici, Vallery [Road], Chandler's Ford, Hants, to Professor Thomson, [Royal Society] | 2 November 1918 |