| 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 |
| 1987 | 1875 June 12 | George H. Sibley | Hiram Sibley |
| 1988 | 1875 June 21 | George H. Sibley | Hiram Sibley |
| 1989 | 1874 July 02 | George H. Sibley | Hiram Sibley |
| 1990 | 1875 July 02 | George H. Sibley | Hiram Sibley |
| 1991 | 1875 September 27 | George H. Sibley | Hiram Sibley |
| 1992 | 1875 November 25 | George H. Sibley | Hiram Sibley |
| 1993 | 1875 | George H. Sibley | Hiram Sibley |
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