| Letter, from Henry J. Van Lennep | Amerikan Bord Heyeti (American Board) | 1856 |
| Letter, to Harrison G.O. Dwight, from Daniel Ladd, contains reasons for not attending the general meeting | Amerikan Bord Heyeti (American Board) | 1842-03-25 |
| Letter, to the Missionaries of the ABCFM, to Harrison G.O. Dwight, from A. Smith | Amerikan Bord Heyeti (American Board) | 1846-05-23 |
| Letter, to the Committee ad Interim, from Daniel Ladd, Smyrna difficulty | Amerikan Bord Heyeti (American Board) | 1866-06-30 |
| Letter, to Henry C. Haskell, from British and Foreign Bible Society | Amerikan Bord Heyeti (American Board) | 1866-07-10 |
| Letter, resolution and note on Aintab and Broosa for the mission | Amerikan Bord Heyeti (American Board) | 1849-12-02 |
| Letter, to the Committee ad Interim, from Sanford Richardson | Amerikan Bord Heyeti (American Board) | 1866-08-18 |
| Letter, to Committee ad Interim, from Jasper N. Ball | Amerikan Bord Heyeti (American Board) | 1866-08-16 |
| Letter, to Henry J. Van Lennep, from Ira F. Pettibone | Amerikan Bord Heyeti (American Board) | 1866-06-26 |
| Letter, to Daniel Ladd, from Ira F. Pettibone | Amerikan Bord Heyeti (American Board) | 1866-06-26 |
