| RefNo | Title |
| DF/ZOO/236/1/38 | External Correspondence: British Ornithologists’ Union |
| DF/ENT/340/26/16 | British Museum (Clay, Theresa Rachel) |
| DF/ZOO/236/3/100 | External Correspondence: Kear, Janet |
| DF/ZOO/236/1/330 | Subject File: Reply to document circulated by the BOU (British Ornithologists' Union) Records Committee (1988) on 'Suggested changes to the English names of some Western Palearctic Birds'. |
| DF/TR/1/1/33/74 | British Ornithologists Union |
| DF/TR/1/1/34/67 | British Ornithologists Union |
| DF/TM/1/38/10 | Correspondence R: Rothschild |
| DF/ZOO/236/4/24 | External Correspondence: Houston, David C |
| DF/ZOO/213/107 | British Ornithologists Union Mascarene Islands Expedition: correspondence |
| DF/TR/1/1/32/58 | British Ornithologists Union |
| DF/TR/1/1/31/76 | British Ornithologists Union |
| DF/TR/1/1/25/25 | Barrow, John |
| DF/ZOO/236/4/175 | External Correspondence: Kear, Janet |
| DF/ZOO/236/4/73 | External Correspondence: Melland, Amicia |
| DF/ZOO/236/4/5 | External Correspondence: Monk DM, Dr J F |
| DF/TR/1/1/24/407 | Sclater, [Phillip] [Lutley] |
| DF/ZOO/236/4/127 | External Correspondence: Monk, James |
| DF/ZOO/230/120/14 | British Ornithologists Union - Centenary Meeting, 20-23 March 1959 |
| DF/ZOO/236/6/149 | External Correspondence: Campbell, Bruce |
| DF/ZOO/236/6/196 | External Correspondence: Medway, Gathorne, Lord |
| DF/ADM/1004/903 | British Ornithologists Union Expedition to the Great Snow Mountains of Dutch New Guinea: correspondence, handmap and memoranda |
| DF/ADM/1004/133 | British Ornithologists Union |
| DF/ZOO/230/120/12 | British Ornithologists’ Union and British Ornithologists’ Club |
| DF/ZOO/236/4/234 | External Correspondence: Houston, David C. |
| DF/TR/1/1/28/85 | British Ornithologists Union |
| DF/ZOO/200/127/55 | British Ornithologists' Union Centenary Expeditions |
| DF/ZOO/230/122/386 | Seychelles: Egg exploitation |
| DF/ZOO/230/1/68 | Godman, F D |
| DF/ZOO/236/6/86 | External Correspondence (Mollusca and Birds): Monk, Dr James F. |
| DF/ZOO/236/13 | Correspondence of Richard Meinertzhagen (1878-1967), ornithologist and donor |
| DF/ADM/1001/42 | Outgoing Letterbook |