| RefNo | Title |
| DF/TM/1/3/2 | Correspondence J: Janson |
| DF/TM/1/43/23 | Correspondence J: Janson |
| DF/TM/1/21/3 | Correspondence J: Janson |
| DF/ZOO/230/4/186-188 | Janson, O E |
| DF/TM/1/14/3 | Correspondence J: Janson |
| DF/ZOO/230/1/102 | Janson, O E |
| DF/TM/1/79 | Correspondence H-K |
| DF/ZOO/200/40/201 | Janson, [Oliver Erichson] |
| DF/ZOO/200/27/201-202 | Janson, Oliver Erichson |
| DF/ZOO/200/25/183 | Janson, Oliver Erichson |
| DF/ZOO/200/30/211 | Janson, Oliver Erichson |
| DF/ZOO/200/31/218 | Janson, Oliver Erichson |
| DF/ZOO/200/36/237 | Janson, Oliver [Erichson] |
| DF/ZOO/200/45/231 | Janson, [Oliver Erichson] |
| DF/ZOO/200/47/219 | Janson, [Oliver Erichson] |
| DF/TR/1/1/24/112 | Dodd, [Frederick] [Parkhurst] |
| DF/ZOO/230/3/151 | Janson, O E |
| DF/TM/1/40/9 | Correspondence W: Webster |
| DF/TM/1/35/17 | Correspondence J: Janson |
| DF/TM/1/8/1 | Correspondence J: Jacoby; Jamrach; Janson |
| DF/TM/1/28/12 | Correspondence J: Janson; Jensink; Johnson |
| DF/ZOO/200/32/204 | Janson, Oliver Erichson |
| DF/ZOO/200/37/225-229 | Janson, Oliver [Erichson] |
| DF/ZOO/200/35/258a | Janson, Oliver [Erichson] |
| DF/ZOO/200/42/195 | Janson, [Oliver Erichson] |
| DF/ZOO/200/44/216 | Janson, [Oliver Erichson] |
| DF/ZOO/200/52/259-261 | Janson, [Oliver Erichson] |
| DF/ZOO/200/52/443-444 | Janson, [Oliver Erichson] |
| DF/ZOO/202/2 | 'Miscellaneous documents': letters, lists, memoranda and reports relating to the work of the department, gathered by Dr A Günther |
| DF/ZOO/252/1/2/81 | Janson, Oliver Erichson (London) |
| DF/ZOO/200/46/250-252 | Janson, [Oliver Erichson] |
| DF/ZOO/200/48/352 | Janson, [Oliver Erichson] |
| DF/ZOO/200/50/117 | Janson, [Oliver Erichson] |
| DF/ZOO/200/51/119-121 | Janson, [Oliver Erichson] |
| WP/18/4/1 | Letter from E F Bates re his father's death and work |