| RefNo | Title | Source |
| WP/16/2/56 | Letter to William Greenell Wallace from the Royal Botanic Gardens, Kew, signed D Prain | |
| DF/BOT/400/1/44 | Calcutta Botanic Garden | |
| DF/BOT/400/17/18 | Correspondence Ph - Pu | |
| DF/BOT/400/13/80 | Prain, David (Royal Botanic Gardens, Kew) | |
| DF/PAL/100/60/108 | Prain, D | |
| DF/BOT/400/13/4 | Bailey, L H (Ithaca, New York, USA; and China) | |
| DF/BOT/400/18/34 | Correspondence Pi - Q | |
| DF/BOT/400/18/22 | Correspondence Hi | |
| DF/BOT/404/9/12/3 | Correspondence: K-R | |
| DF/BOT/404/9/11/4 | Correspondence: P-W | |
| DF/BOT/404/1/6/35 | Prain | |
| DF/BOT/404/9/10/1 | Correspondence: B-W | |
| DF/BOT/400/2/87 | Prain, David (Kew Royal Botanic Gardens) | |
| DF/BOT/400/4/87 | Kew Royal Botanic Gardens | |
| DF/BOT/400/9/58 | Ridley, Henry Nicholas (Kew Royal Botanic Gardens) | |