| Reference number | Title | Date |
| EC/1922/03 | Douglas, Claude Gordon: certificate of election to the Royal Society | |
| GLB/19/1/72 | C G Douglas, Marston Ferry Road, Oxford to Brown | 7 February 1960 |
| RR/27/77 | Referee's report by Claude Gordon Douglas, on a paper 'The oxygen-dissociation curve of blood, and its thermodynamical basis' by W E L Brown and Archibald Vivian Hill | 4 August 1922 |
| RR/19/37 | Referee's report by Leonard Erskine Hill, on a paper 'Physiological observations made on Pike's Peak, Colorado, with special reference to adaptation to low barometric pressures' by Claude Gordon Douglas, John Scott Haldane, Yandell Henderson and Edward C Schneider | [August 1912] |
| RR/19/38 | Referee's report by Joseph Barcroft, on a paper 'Physiological observations made on Pike's Peak, Colorado, with special reference to adaptation to low barometric pressures' by Claude Gordon Douglas, John Scott Haldane, Yandell Henderson and Edward C Schneider | [October 1912] |
| RR/51/78 | Referee's report by Claude Gordon Douglas, on a paper 'The duration of the recovery period following strenuous muscular exercise' by O M Solandt and Jessie H Ridout | [May 1933] |
| RR/55/9 | Referee's report by Claude Gordon Douglas, on a paper 'Respiratory variations of the heart rate - I—The reflex mechanism of the respiratory arrhythmia' by Gleb Anrep, W Pascual and R Rössler | 2 November 1935 |
| RR/55/11 | Referee's report by Claude Gordon Douglas, on a paper 'Respiratory variations of the heart rate - II—The central mechanism of the respiratory arrhythmia and the inter-relations between the central and the reflex mechanisms' by Gleb Anrep, W Pascual and R Rössler | 2 November 1935 |
| RR/55/64 | Referee's report by Claude Gordon Douglas, on a paper 'The oxidation of hæmoglobin to methæmoglobin by oxygen' by J Brooks | 9 August 1935 |
| RR/61/70 | Referee's report by Claude Gordon Douglas, on a paper 'The action of nitrite on haemoglobin in the absence of oxygen' by J Brooks | 7 May 1937 |
| RR/67/63 | Referee's report by Edward Provan Cathcart, on a paper 'Adrenaline and muscular exercise' by F C Courtice, Claude Gordon Douglas and J G Priestley | April 1939 |
| RR/57/50 | Referee's report by Claude Gordon Douglas, on a paper 'The regulation of respiration in the flea, xenopsylla cheopis, Roths. (Pulicidea)' by Vincent Brian Wigglesworth | [July 1935] |
| RR/65/63 | Referee's report by Edward Provan Cathcart, on a paper 'Carbohydrate metabolism and muscular exercise' by F C Courtice, Claude Gordon Douglas and J G Priestley | November 1938 |
| RR/61/96 | Referee's report by Claude Gordon Douglas, on a paper 'The duration of the recovery period following strenuous muscular exercise, measured to a base line of steady mild exercise' by C R Cowan and C M Solandt | March 1937 |
| RR/65/62 | Referee's report by John Beresford Leathes, on a paper 'Carbohydrate metabolism and muscular exercise' by F C Courtice, Claude Gordon Douglas and J G Priestley | November 1938 |
| RR/65/152 | Referee's report by Claude Gordon Douglas, on a paper 'Individual variations in ability to acclimatize to high altitude' by Ancel Keys, Bryan Harold Cabot Matthews, W H Forbes and Ross A McFarland | 8 May 1938 |
| NLB/57/165 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to CG [Claude Gordon] Douglas Esq, FRS; St Johns College, Oxford | 1 August 1919 |
| NLB/57/152 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Professor FG [Frederick Gowland] Hopkins, FRS, Chairman of the Physiology Committee | 30 July 1919 |
| RR/64/85 | Referee's report by Claude Gordon Douglas, on a paper 'Individual variations in ability to acclimatize to high altitude' by Ancel Keys, Bryan Harold Cabot Matthews, W H Forbes and Ross A McFarland | 8 April 1937 |
| NLB/72/861 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Dr [Claude Gordon] Douglas, CMG, FRS | 4 June 1930 |
| RR/55/96 | Referee's report by Archibald Vivian Hill, on a paper 'The effects of prolonged muscular exercise on the metabolism' by F C Courtice and Claude Gordon Douglas | 4 November 1935 |
| NLB/73/89 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Dr. [Claude Gordon] Douglas, C.M.G., FRS | 26 November 1930 |
| NLB/57 | New Letter Book volume 57, copy letters sent from Royal Society administration | 27 June 1919-27 February 1920 |