| Letter, to Henry O. Dwight, from British Embassy | Amerikan Bord Heyeti (American Board) | 1896-10-26 |
| Letter, to Ira F. Pettibone, from [Hagopos Djedjiniyan] | Amerikan Bord Heyeti (American Board) | 1884-05-19 |
| Letter, to Ira F. Pettibone, from Hagopos Djedjiniyan ? | Amerikan Bord Heyeti (American Board) | 1884-05-19 |
| Letter, to Joseph K. Greene, from Lyndon S. Crawford | Amerikan Bord Heyeti (American Board) | 1910-05-26 |
| Letter, to Mabel E. Emerson, Boston (Mass.), from Luther R. Fowle | Amerikan Bord Heyeti (American Board) | 1936-04-14 |
 | Letter, to Mabel E. Emerson, Boston (Mass.), from Luther R. Fowle, Treasurer | Amerikan Bord Heyeti (American Board) | 1936-01-31 |
| Letter, to Members of the Western Turkey Mission, from Harriet G. Powers | Amerikan Bord Heyeti (American Board) | 1880 |
| Letter, to Miss Gage regarding the YWCA, from the Annual Meeting | Amerikan Bord Heyeti (American Board) | 1913-07-09 |
 | Letter, to Mr. Hitchcock, from P. Suhle (?) | Amerikan Bord Heyeti (American Board) | 1883-05-03 |
| Letter, to Pastors and members of Evangelical Churches in Turkey, from Brethren Riggs, Farnsworth, Marden, Barnum and Wood | Amerikan Bord Heyeti (American Board) | - |
| Letter, to Secretary, American Tract Society from L.yman Bartlett and Theodore A. Baldwin | Amerikan Bord Heyeti (American Board) | 1884 |
| Letter, to Secretary, American Tract Society, from Fred L. Kingsbury and Charles S. Dwight | Amerikan Bord Heyeti (American Board) | 1885 |
| Letter, to the Committee ad Interim of the Western Turkey Mission, from Walter H. Giles Missionary at Cesarea | Amerikan Bord Heyeti (American Board) | 1866-08-02 |
| Letter, to the Cyrus Hamlin | Amerikan Bord Heyeti (American Board) | 1854-23 |
 | Letter, to the members of Constantinople Station, by Charles T. Riggs | Amerikan Bord Heyeti (American Board) | 1902-03-21 |
| Letter, to William Goodell, from Henry Hill | Amerikan Bord Heyeti (American Board) | 1844-11-15 |
| Letter, to William Goodell, from Henry Hill | Amerikan Bord Heyeti (American Board) | 1840-10-15 |
| Letter, to William Goodell, from Henry Hill | Amerikan Bord Heyeti (American Board) | 1840-09-12 |
| Letter, to William Goodell, from Henry Hill | Amerikan Bord Heyeti (American Board) | 1834-09-27 |
| Letter, to William Goodell, from Henry Hill | Amerikan Bord Heyeti (American Board) | 1835-08-28 |
