| 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 |
| 2601 | 1849 February 14 | Oliver W. Whitney | Hiram Sibley |
| 2602 | 1848 February 27 | Oliver W. Whitney | Hiram Sibley |
| 2603 | 1849 | Oliver W. Whitney | Hiram Sibley |
| 2604 | 1849 March 20 | Oliver W. Whitney | Hiram Sibley |
| 2605 | 1849 March 28 | Oliver W. Whitney | Hiram Sibley |
| 2606 | 1848 April 05 | Oliver W. Whitney | Hiram Sibley |
| 2607 | 1848 April 28 | Oliver W. Whitney | Hiram Sibley |
| 2608 | 1849 July 09 | Oliver W. Whitney | Hiram Sibley |
| 2609 | 1848 July 10 | Oliver W. Whitney | Hiram Sibley |
| 2610 | 1848 August 21 | Oliver W. Whitney | Hiram Sibley |
| 2611 | 1847 September 03 | Oliver W. Whitney | Hiram Sibley |
| 2612 | 1848 September 04 | Oliver W. Whitney | Hiram Sibley |
| 2613 | 1847 September 27 | Oliver W. Whitney | Hiram Sibley |
| 2614 | 1847 October 04 | Oliver W. Whitney | Hiram Sibley |
| 2615 | 1847 November 01 | Oliver W. Whitney | Hiram Sibley |
| 2616 | 1847 November 19 | Oliver W. Whitney | Hiram Sibley |
| 2617 | 1847 November 19 | Oliver W. Whitney | Hiram Sibley |
| 2618 | 1847 November 22 | Oliver W. Whitney | Hiram Sibley |
| 2619 | 1848 December 18 | Oliver W. Whitney | Hiram Sibley |
| 2620 | 1848 December 22 | Oliver W. Whitney | Hiram Sibley |
| 2621 | 1847 December 31 | Oliver W. Whitney | Hiram Sibley |
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