Royal Botanic Gardens, Kew: 1997 Accessions Royal Botanic Gardens, Kew
- John William Purseglove (1912-91), tropical crop specialist: papers rel to plant collecting in Uganda and south east Asia
- Colin G Trapnell: botanical and agricultural papers incl notebooks, diaries and photographs rel to Zambia, Zimbabwe, Kenya and Southern Africa 1926-70
- Philip John Owen Trist (1908-96): corresp with Dr CE Hubbard rel to grasses
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