- FondsYapp - Papers and photographs of R. H. (Harry) Yapp
- Series4 - Drawings
- 3 more...
- File4 - Illustrations for Two Malayan 'Myrmecophilous' Ferns
- File5 - Drawings for Fruit-dispersal in Adenostemma viscosum
- Item6 - Drawing of root system
- Item7 - Drawing of Dovey estuary
- File8 - Drawings for publications