- FondsYapp - Papers and photographs of R. H. (Harry) Yapp
- Series2 - Correspondence
- 9 more...
- Subseries10 - Professional correspondence
- Subseries11 - Letters 1913-14
- 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
- 8 more...