| Circular letter, Circular from Herman N. Barnum, Secretary, Harpoot Station | Amerikan Bord Heyeti (American Board) | 1859-07-28 |
| Circular letter, from Tillman C. Trowbridge, on behalf of the Committee ad Interim | Amerikan Bord Heyeti (American Board) | 1859-08-28 |
| Circular letter, to the Native churches, from Constantinople Station in regards to aiding their Pastors and preachers, Tillman C. Trowbridge and E. Riggs | Amerikan Bord Heyeti (American Board) | 1862-01-08 |
| Circular letter, to the stations, from E. Riggs | Amerikan Bord Heyeti (American Board) | 1855-02-20 |
| Circular letter, from Wilson A. Farnsworth | Amerikan Bord Heyeti (American Board) | 1863-01-14 |
| Circular letter, from Missionary House, Boston to Northern Armenian Mission, by Rufus Anderson | Amerikan Bord Heyeti (American Board) | 1859-11-08 |
| Circular letter, to the stations in Turkey, by Tillman C. Trowbridge | Amerikan Bord Heyeti (American Board) | 1862-01-21 |
| Circular letter, to Edwin E. Bliss, from E. Riggs and George Washburn | Amerikan Bord Heyeti (American Board) | 1862-01-20 |
| Circular letter, from Committee ad Interim, Tillman C. Trowbridge and E. Riggs | Amerikan Bord Heyeti (American Board) | 1861 |
| Circular letter, Circular in regard to Annual Meeting, Tillman C. Trowbridge | Amerikan Bord Heyeti (American Board) | 1862-02-21 |