| Circular letter, to the stations, from E. Riggs | Amerikan Bord Heyeti (American Board) | 1855-02-20 |
| Letter, to E. Riggs, from Daniel Ladd | Amerikan Bord Heyeti (American Board) | 1855-01-31 |
| Letter, to E. Riggs, from J. Pratt, Aintab Station | Amerikan Bord Heyeti (American Board) | 1855-01-17 |
| Letter, to the Constantinople Station, from Daniel Ladd, Smyrna Station | Amerikan Bord Heyeti (American Board) | 1854-10-24 |
| Letter, to Edwin E. Riggs, from Benjamin Barker | Amerikan Bord Heyeti (American Board) | 1854-09-07 |
| Letter, to Harrison G.O. Dwight, from Benjamin Barker | Amerikan Bord Heyeti (American Board) | 1854-08-24 |
| Letter, to Josiah Peabody, from Harrison G.O. Dwight | Amerikan Bord Heyeti (American Board) | 1854-06-10 |
| Letter, to the George P. Marsh, from William Goodell, H. G. Dwight, William G. Schaffler, Edwin E. Riggs, J. S. Everett, Cyrus Hamlin | Amerikan Bord Heyeti (American Board) | 1853-12-13 |
| Letter, to Edwin E. Bliss, from Henry J. Van Lennep | Amerikan Bord Heyeti (American Board) | 1853-09-06 |
| Letter, to native pastors, from E. Riggs and Edwin E. Bliss | Amerikan Bord Heyeti (American Board) | 1853-06-10 |
| Letter, to Harrison G.O. Dwight | Amerikan Bord Heyeti (American Board) | 1845-05-16 |
| Letter, to the Committee ad Interim, from Daniel Ladd | Amerikan Bord Heyeti (American Board) | 1866-08-27 |
| Letter, to the Committee ad Interim, from Henry J. Van Lennep | Amerikan Bord Heyeti (American Board) | 1866-08-04 |
| Letter, to the Committee ad Interim, from Henry J. Van Lennep | Amerikan Bord Heyeti (American Board) | 1866-05-23 |
| Letter, to Charles F. Morse, from Tillman C. Trowbridge | Amerikan Bord Heyeti (American Board) | 1866-04-08 |
| 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) | 1866-02-17 |
| Letter, to Henry J. Van Lennep, from Tillman C. Trowbridge | Amerikan Bord Heyeti (American Board) | 1866-02-14 |
| Letter, to Committee ad Interim, from Jasper N. Ball | Amerikan Bord Heyeti (American Board) | 1865-10-23 |
| Letter, to Tillman C. Trowbridge, from Sanford Richardson | Amerikan Bord Heyeti (American Board) | 1865-04-14 |