| RefNo | Title | Date |
| EC/1886/15 | Warington, Robert: certificate of election to the Royal Society | |
| IM/Maull/004795 | Warington, Robert | nd |
| NLB/35/455 | Copy letter from Robert William Frederick Harrison, to M P Monnot, Secretaire de la Redaction, "Larousse Mensuel", 17 Rye Montparnasse, Paris | 3 June 1907 |
| NLB/4/991 | Copy letter from Herbert Rix, to Robert Warington, Fellow of the Royal Society | 16 December 1890 |
| NLB/4/1015 | Copy letter from Herbert Rix, to Robert Warington, Fellow of the Royal Society | 22 December 1890 |
| NLB/6/165 | Copy letter from Herbert Rix, to Richard Warington, Fellow of the Royal Society | 16 March 1892 |
| NLB/7/793 | Copy letter from Herbert Rix, to Robert Warington, Fellow of the Royal Society | 26 April 1893 |
| RR/16/282 | Referee's report by Robert Warington, on a paper 'A study of the process of nitrification with reference to the purification of sewage' by Miss Harriette Chick | 6 May 1905 |
| RR/16/318 | Referee's report by Robert Warington, on a paper 'The effect of plant growth & of manures upon the soil: the retention of bases by the soil' by A D Hall and N H J Miller | 28 April 1905 |
| NLB/22/279 | Copy letter from Robert William Frederick Harrison, to [Robert] Warington, Fellow of the Royal Society | 3 April 1901 |
| NLB/18/661 | Copy letter from Robert William Frederick Harrison, to R Warington, Fellow of the Royal Society | 17 April 1899 |
| NLB/20/434 | Copy letter from Robert William Frederick Harrison, to Robert Warington, Fellow of the Royal Society | 25 April 1900 |
| NLB/27/325 | Copy letter from Theodore E James, to Robert Warington, Fellow of the Royal Society, High Bank, Harpenden, Hertfordshire | 8 August 1903 |
| NLB/27/306 | Copy letter from Robert William Frederick Harrison, to Professor Robert Warington, Fellow of the Royal Society | 4 August 1901 |
| NLB/27/342 | Copy letter from Theodore E James, to Robert Warington, Fellow of the Royal Society | 13 August 1903 |
| NLB/26/841 | Copy letter from Robert William Frederick Harrison to, Robert Warington, Fellow of the Royal Society | 10 June 1903 |
| NLB/27/845 | Copy letter from Robert William Frederick Harrison, to Robert Warington, Fellow of the Royal Society | 9 December 1903 |
| NLB/31/79 | Copy letter from Robert William Frederick Harrison, to Professor Robert Warington, Fellow of the Royal Society | 19 June 1905 |
| RR/14/27 | Referee's report by Robert Warington, on a paper '“Nitragin” and the nodules of leguminous plants' by Maria Dawson | 8 December 1898 |
| RR/14/135 | Referee's report by Robert Warington, on a paper 'Further observations on the nature and functions of the nodules of leguminous plants' by Maria Dawson | 6 January 1900 |
| RR/14/138 | Second referee's report by Robert Warington, on a paper 'Further observations on the nature and functions of the nodules of leguminous plants' by Maria Dawson | 27 April 1900 |
| RR/10/341 | Referee's report by Robert Warington, on a paper 'The nitrifying process and its specific ferment.—Part I' by Percy Faraday Frankland and Grace C Frankland | 19 April 1890 |
| NLB/19/792 | Copy letter from Robert William Frederick Harrison, Dr Dukinfield Henry Scott, Chairman of the Botany Sectional Committee | 20 December 1899 |
| RR/12/272 | Referee's report by Robert Warington, on two papers 'Experimental researches on vegetable assimilation and respiration.—No. I. On a new method for investigating the carbonic acid exchanges of plants' and 'Experimental researches on vegetable assimilation and respiration.—No. II. On the paths of gaseous exchange between aerial leaves and the atmosphere' by Frederick Frost Blackman | 1 January 1895 |
| RR/14/32 | Second referee's report by Robert Warington, on a paper '“Nitragin” and the nodules of leguminous plants' by Maria Dawson | 21 April 1899 |
| RR/14/136 | Detailed referee's report by Robert Warington, on a paper 'Further observations on the nature and functions of the nodules of leguminous plants' by Maria Dawson | 6 January 1900 |
| MC/15/113 | Letter from [Robert] Warington, Harpenden, Hertfordshire, to the Secretary of the Royal Society | 22 November 1890 |
| MC/15 | Volume 15 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1889-1892 |
| MC/23/93 | Letter from [Martin Onslow] Forster, Chemical Society, Burlington House, London, to Robert Harrison, Assistant Secretary, Royal Society, Burlington House | 3 April 1908 |
| MC/22/172 | Letter from M P Monnot, Secretaire de la Redaction, "Larousse Mensuel", 17 Rye Montparnasse, Paris, to the President of the Royal Society | 30 May 1907 |
| MC/22 | Volume 22 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1907 |
| MC/23/92 | Letter from [Martin Onslow] Forster, Chemical Society, Burlington House, London, to the Secretary, Royal Society, Burlington House | 20 March 1908 |
| MC/23 | Volume 23 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1908 |