| Reference Number | Title | Date |
| RBC/24 | Letter from Oliver Pemberton to Richard Butcher | 4 October 1854 |
| RBC/38 | Letter from Oliver Pemberton to Richard Butcher | 20 November 1854 |
| RBC/51 | Letter from Oliver Pemberton To Richard Butcher | 2 September 1854 |
| RBC/103 | Letter from Oliver Pemberton to Richard Butcher | 15 March 1856 |
| RBC/118 | Letter from Oliver Pemberton to Richard Butcher | 21 November 1855 |
| RBC/146 | Letter from Oliver Pemberton to Richard Butcher | 30 September 1856 |
| RBC/201 | Letter from Oliver Pemberton to Richard Butcher | 14 February 1857 |
| RBC/205 | Letter from Oliver Pemberton to Richard Butcher | 3 June 1857 |