| Results | |||
| Note: A ? indicates the information presented is a 'best guess'. The information on the original letter is unknown or illegible and may not be completely accurate. | |||
| Letter Number | Letter Date | Written By | Written To |
| 1548 | 1858 March 26 | R. M. Oliphant | Hiram Sibley |
| 1549 | 1857 September 28 | Henry O'Reilly | Hiram Sibley |
| 1550 | 1858 April 01 | Charles O. Otis | Hiram Sibley |
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