| RefNo | Title | Source |
| DF/BOT/407/30 | Official diary: Ivan M Lamb | |
| DF/BOT/423/1 | Lamb, Ivan Mackenzie | |
| DF/ADM/1005/48 | Lamb, Ivan M | |
| DF/BOT/423/1/8 | Lamb, Ivan Mackenzie: Lists of Bernt Lynge's Arctic Lichen publications. | |
| DF/BOT/423/1/1 | Lamb, Ivan Mackenzie: Book reviews; clippings and handwritten reviews | |
| DF/BOT/423/1/12 | Lamb, Ivan Mackenzie: Falkland Islands Dependency Survey (Operation Tabarin) | |
| DF/BOT/423/1/11 | Lamb, Ivan Mackenzie: List of unnamed lichen collection from Canada and Alaska in the British Museum Cryptogamic Herbarium. | |
| DF/MIN/1/72/32 | Lamb, I M | |
| DF/BOT/423/1/13 | Lamb, Ivan Mackenzie: Vicia descriptions | |
| DF/BOT/423/1/6 | Lamb, Ivan Mackenzie: Bibliography of Arctic Lichens (incomplete). | |
| DF/BOT/407/31 | Official diary: Ivan M Lamb | |
| DF/BOT/407/32 | Official diary: Ivan M Lamb | |
| DF/BOT/423/1/7 | Lamb, Ivan Mackenzie: Notes on Lichens of Greenland: Notulae and Lichenographiam Arcticam. | |
| DF/BOT/423/1/5 | Lamb, Ivan Mackenzie: Lichens of the Shetlands Discovery Expedition, | |
| DF/BOT/423/1/3 | Lamb, Ivan Mackenzie: Expedition notebook listing specimens collected in North Cornwall. | |
| DF/BOT/423/1/4 | Lamb, Ivan Mackenzie: British Graham Land Expedition | |
| DF/BOT/423/1/10 | Lamb, Ivan Mackenzie: List of lichens collected and deposited in the British Museum Herbarium from Discovery Expeditions, 1931- 1937. | |
| DF/BOT/405/12 | Lamb, I M: Lichenological notes IV - Rhizocarpon sect Catocarpon in the British Isles | |
| DF/BOT/423/1/9 | Lamb, Ivan Mackenzie: Lists of Crocynia species recorded by Bernt Lynge from the Arctic. | |
| DF/ENT/305/79 | Lists of collecting stations: Falkland Islands, Operation Tabarin, I Mackenzie Lamb | |
| DF/BOT/423/1/2 | Lamb, Ivan Mackenzie: Expedition notebooks giving locations of collected specimens | |
| DF/BOT/423 | Lichen Section: Correspondence and Papers | |