| Letter, to Mabel E. Emerson, Boston (Mass.), from Luther R. Fowle | Amerikan Bord Heyeti (American Board) | 1936-03-14 |
 | Letter, to the members of Constantinople Station, by Charles T. Riggs | Amerikan Bord Heyeti (American Board) | 1902-03-21 |
 | Letter, to Charles T. Riggs, from H. T. Perry | Amerikan Bord Heyeti (American Board) | 1910-10-31 |
| Letter, to Charles T. Riggs, from Ralph S. Harlow | Amerikan Bord Heyeti (American Board) | 1912-07-10 |
| Letter, to Charles T. Riggs, from Henry K. Wingate | Amerikan Bord Heyeti (American Board) | 1912-10-11 |
 | Letter, to Charles T. Riggs, from Ernest C. Partridge | Amerikan Bord Heyeti (American Board) | 1913-02-28 |
 | Letter, to Charles T. Riggs, from Ernest C. Partridge | Amerikan Bord Heyeti (American Board) | 1912-07-13 |
 | Letter, to Charles T. Riggs, from Theodore A.Elmer | Amerikan Bord Heyeti (American Board) | 1911-11-11 |
 | Letter, to Charles T. Riggs, from Ernest C. Partridge | Amerikan Bord Heyeti (American Board) | 1912-02-03 |
 | Letter, to Charles T. Riggs, from Charles K. Tracy | Amerikan Bord Heyeti (American Board) | 1911-11-22 |
