| 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 |
| 422 | 1860 February 29 | John D. Campbell | Hiram Sibley |
| 423 | 1860 April 25 | John D. Campbell | George Bliss |
| 424 | 1859 August 05 | John D. Campbell | Hiram Sibley |
| 425 | 1858 November 04 | John D. Campbell | Hiram Sibley |
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