- FondsYapp - Papers and photographs of R. H. (Harry) Yapp
- Series2 - Correspondence
- 11 more...
- Subseries12 - Congratulations upon marriage
- Subseries13 - Description of wedding
- Subseries14 - Love letters LKY to RHY post-wedding
- Subseries15 - Love letters RHY to LKY post-wedding
- Subseries16 - Belfast
- Subseries17 - World War
- Subseries18 - Letters regarding the birth of children
- Subseries19 - Letters from RHY to Lajla 1915-26
- Subseries20 - Letters from Lajla to RHY 1915-19
- 6 more...