| 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 |
| 1536 | 1863 March 04 | George H. Mumford | Hiram Sibley |
| 1537 | 1863 March 11 | George H. Mumford | Hiram Sibley |
| 1538 | 1865 March 20 | George H. Mumford | Glass Elliot & Company |
| 1539 | 1863 April 03 | George H. Mumford | Hiram Sibley |
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