| Reference number | Title | Date |
| MM/18/42 | Funeral arrangements for Sir Theodore Morris Sugden | 5 May 1984 |
| HWT/8/2/36 | Correspondence and papers regarding funding and EUCHEM Conferences on Molten Salts | March - December 1978 |
| HWT/8/2/43 | Correspondence and papers regarding organisation of individual EUCHEM Conferences, rules regarding central fund grants and nineteenth meeting of Committee for EUCHEM Conferences | January - February 1980 |
| MM/18/43 | Letter from AR Todd to Dr RWJ Keay, Executive Secretary, Royal Society | 8 March 1978 |
| IM/GA/WRS/9113 | Sugden, Sir Theodore Morris | nd |
| RR/70/12 | Letter from Robert Whytlaw-Gray, on a paper 'The physical investigation of certain hygroscopic aerosols' by D W E Axford, K F Sawyer and Theodore Morris Sugden | 12 April 1948 |
| RR/72/21 | Referee's report by Cyril Norman Hinshelwood, on a paper 'Studies on the ionization produced by metallic salts in flames II. Reactions governed by ionic equilibria in coal-gas/air flames containing alkali metal salts' by H Belcher and Theodore Morris Sugden | 1949 |
| RR/70/10 | Referee's report by Robert Whytlaw-Gray, on a paper 'The physical investigation of certain hygroscopic aerosols' by D W E Axford, K F Sawyer and Theodore Morris Sugden | October 1947 |
| RR/70/11 | Letter from Robert Whytlaw-Gray, on a paper 'The physical investigation of certain hygroscopic aerosols' by D W E Axford, K F Sawyer and Theodore Morris Sugden | 1 December 1947 |
| RR/72/20 | Referee's report by Alfred Charles Glyn Egerton, on a paper 'Studies on the ionization produced by metallic salts in flames II. Reactions governed by ionic equilibria in coal-gas/air flames containing alkali metal salts' by H Belcher and Theodore Morris Sugden | 1949 |
| RR/72/22 | Referee's report by Alfred Charles Glyn Egerton, on a paper 'Studies on the ionization produced by metallic salts in flames I. The determination of the collision frequency of electrons in coal-gas/air flames' by H Belcher and Theodore Morris Sugden | 1949 |
| RR/72/23 | Referee's report by Cyril Norman Hinshelwood, on a paper 'Studies on the ionization produced by metallic salts in flames I. The determination of the collision frequency of electrons in coal-gas/air flames' by H Belcher and Theodore Morris Sugden | 1949 |
| EC/1963/23 | Sugden, Theodore Morris: certificate of election to the Royal Society | |
| RR/75/181 | Referee's report by Cyril Norman Hinshwelwood, on a paper 'Studies on the ionization produced by metallic salts, in flames. III. Ionic equilibria in hydrogen / air flames containing alkali metal salts' by H Smith and Theodore Morris Sugden | 23 July 1951 |
| RR/75/182 | Referee's report by Cyril Norman Hinshwelwood, on a paper 'Studies on the ionization produced by metallic salts, in flames. IV. The stability of gaseous alkali hydroxides in flames' by H Smith and Theodore Morris Sugden | 23 July 1951 |
| RR/79/59 | Referee's report by Dudley Maurice Newitt, on a paper 'The stability of gaseous lithium hydroxide at high temperatures and its relation with the hydroxyl concentration of flame gases' by H Smith and Theodore Morris Sugden | 14 April 1953 |