| 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 |
| 36 | 1862 January 14 | Pliny Allen | Hiram Sibley |
| 37 | 1862 February 22 | Pliny Allen | Hiram Sibley |
| 38 | 1860 May 08 | Pliny Allen | Hiram Sibley |
| 39 | 1862 December 26 | Pliny Allen | Hiram Sibley |
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