- FondsYapp - Papers and photographs of R. H. (Harry) Yapp
- Series2 - Correspondence
- 17 more...
- Subseries18 - Letters regarding the birth of children
- Subseries19 - Letters from RHY to Lajla 1915-26
- Subseries20 - Letters from Lajla to RHY 1915-19
- Subseries21 - The house in Birmingham
- Subseries22 - Correspondence 1919-20
- Subseries23 - Family letters
- Subseries24 - Swiss trip 1923
- Subseries25 - RHY to Lajla 1920s
- Subseries26 - Final illness and condolences