| Reference Number | Title | Date |
| RBC/40 | Letter from John Eirchsen to Richard Butcher | 7 December 1854 |
| RBC/41 | Letter from John Eirchsen to Richard Butcher | 9 February 1855 |
| RBC/43 | Letter from John Eirchsen to Richard Butcher | 18 February 1855 |
| RBC/83 | Letter from John Eirchsen to Richard Butcher | 8 November 1855 |
| RBC/106 | Letter from John Erichsen to Richard Butcher | 23 March 1856 |
| RBC/138 | Letter from Edward William Pritchard to Richard Butcher | 27 September 1856 |
| RBC/145 | Letter from John Erichsen to Richard Butcher | 5 OCtober 1856 |
| RBC/176 | Letter from John Erichsen to Richard Butcher | 1 October 1856 |
| RBC/207 | Letter from John Erichsen to Richard Butcher | 18 November 1857 |