- FondsYapp - Papers and photographs of R. H. (Harry) Yapp
- Series4 - Drawings
- File1 - Drawings for "The salt marshes of the Dovey estuary"1917
- File2 - Drawings for "Spiraea ulmaria" 1912
- File3 - Drawings for "Stratification" 1909
- File4 - Illustrations for Two Malayan 'Myrmecophilous' Ferns
- File5 - Drawings for Fruit-dispersal in Adenostemma viscosum
- Item6 - Drawing of root system
- 2 more...