| Reference number | Title | Date |
| EC/1886/06 | Festing, Edward Robert: certificate of election to the Royal Society | |
| IM/Maull/001406 | Festing, Edward Robert | nd |
| IM/Maull/001407 | Festing, Edward Robert | nd |
| NLB/2/592 | Copy letter from an unknown correspondent, to Messrs West Newman & Company | 19 September 1888 |
| NLB/2/493 | Copy letter from an unknown correspondent, to Messrs West, Newman & Company, 54 Hatton Garden | 18 July 1888 |
| NLB/2/523 | Copy letter from an unknown correspondent, to Messrs West, Newman & Company | 26 July 1888 |
| NLB/2/492 | Copy letter from an unknown correspondent, to Messrs J P Collings & Company | 18 July 1888 |
| NLB/2/504 | Copy letter from Herbert Rix, to General Edward Robert Festing, Fellow of the Royal Society | 23 July 1888 |
| NLB/6/1027 | Copy letter from Herbert Rix, to Lord Rayleigh [John William Strutt] | 5 October 1892 |
| NLB/6/1070 | Copy letter from Herbert Rix, to Richard E S Cooper, 115 Nantwich Road, Crewe | 18 October 1892 |
| NLB/6/1058 | Copy letter from Herbert Rix, to General Edward Robert Festing | 14 October 1892 |
| NLB/8/915 | Copy letter from Herbert Rix, to General Edward Robert Festing, Fellow of the Royal Society | 22 January 1894 |
| NLB/13/115 | Copy letter from Robert William Frederick Harrison, to General Edward Robert Festing, Fellow of the Royal Society | 17 June 1896 |
| NLB/21/672 | Copy letter from Robert William Frederick Harrison, to General Edward Robert Festing, Fellow of the Royal Society, 30 Queens Gate Terrace, S.W. | 5 January 1901 |
| NLB/21/383 | Copy letter from Robert William Frederick Harrison, to Major General Edward Robert Festing, Fellow of the Royal Society | 9 November 1900 |
| RR/8/270 | Referee's report by William Huggins, on a paper 'On the influence of the atomic grouping in the molecules of organic bodies on their absorption in the infra-red region of the spectrum' by William de Wiveleslie Abney and Edward Robert Festing | 3 March 1881 |
| RR/9/323 | Referee's report by John William Strutt, Lord Rayleigh, on the Bakerian Lecture 'Colour photometry' by William de Wivelesile Abney and Edward Robert Festing | 1886 |
| RR/9/322 | Referee's report by Augustus George Vernon Harcourt, on the Bakerian Lecture 'Colour photometry' by William de Wivelesile Abney and Edward Robert Festing | 12 April 1886 |
| RR/10/117 | Referee's report by George Gabriel Stokes, on a paper 'Colour photometry.—Part II. The measurement of reflected colours' by William De Wiveleslie Abney and Edward Robert Festing | 5 July 1888 |
| RR/10/118 | Referee's report by John William Strutt, Lord Rayleigh, on a paper 'Colour photometry.—Part II. The measurement of reflected colours' by William De Wiveleslie Abney and Edward Robert Festing | [1888] |
| NLB/2/649 | Copy letter from Herbert Rix, to Captain William de Wiveleslie Abney, Fellow of the Royal Society | 4 October 1888 |
| NLB/3/721 | Copy letter from Herbert Rix, to the Secretary of The Pasteur Fund, Mansion House | 24 September 1889 |