| Estimates, Erzrum Station, 1854 | Amerikan Bord Heyeti (American Board) | 1854 |
| Letter, to the Committee ad Interim, from Henry J. Van Lennep | Amerikan Bord Heyeti (American Board) | 1866-05-23 |
| Letter, to Henry J. Van Lennep, from Tillman C. Trowbridge | Amerikan Bord Heyeti (American Board) | 1866-02-14 |
| Letter, to the Committee ad Interim, from Henry J. Van Lennep | Amerikan Bord Heyeti (American Board) | 1866-08-04 |
| Letter, to Tillman C. Trowbridge, from Charles F. Morse | Amerikan Bord Heyeti (American Board) | 1866-03-20 |
| Letter, to the Committee ad Interim, from Daniel Ladd | Amerikan Bord Heyeti (American Board) | 1866-08-27 |
| Letter, to Charles F. Morse, from Tillman C. Trowbridge | Amerikan Bord Heyeti (American Board) | 1866-04-08 |
 | Letter, to Tillman C. Trowbridge, from Sanford Richardson | Amerikan Bord Heyeti (American Board) | 1865-04-14 |
| Letter, to Committee ad Interim, from Jasper N. Ball | Amerikan Bord Heyeti (American Board) | 1865-10-23 |
| Letter, to the Committee ad Interim, from Daniel Ladd | Amerikan Bord Heyeti (American Board) | 1866-02-17 |
