| 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 |
| 459 | 1867 February 20 | Cassius Marcellus Clay | Hiram Sibley |
| 460 | 1867 March 16 | Cassius Marcellus Clay | Hiram Sibley |
| 461 | 1867 April 20 | Cassius Marcellus Clay | Hiram Sibley |
| 462 | 1866 December 21 | Cassius Marcellus Clay | Hiram Sibley |
| 463 | 1866 December 26 | Cassius Marcellus Clay | Hiram Sibley |
| 464 | 1866 December 28 | Cassius Marcellus Clay | Hiram Sibley |
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