 | Letter, regarding application to the Committee ad Interim, to Tillman C. Trowbridge | Amerikan Bord Heyeti (American Board) | 1860 |
| Letter, to Charles T. Riggs, from Charlette R. Willard | Amerikan Bord Heyeti (American Board) | 1913-01-25 |
 | Letter, to Charles T. Riggs, from Charlotte R. Willard | Amerikan Bord Heyeti (American Board) | 1912-02-24 |
 | Letter, to Charles T. Riggs, from Charlotte R. Willard | Amerikan Bord Heyeti (American Board) | 1912-04-20 |
 | Letter, to Charles T. Riggs, from George E. White | Amerikan Bord Heyeti (American Board) | 1912-05-25 |
 | Letter, to Charles T. Riggs, from George E. White | Amerikan Bord Heyeti (American Board) | 1911-05-17 |
| Letter, to Charles T. Riggs, from H. T. Perry | Amerikan Bord Heyeti (American Board) | 1910-10-22 |
| Letter, to Charles T. Riggs, from Henry K. Wingate | Amerikan Bord Heyeti (American Board) | 1910-12-10 |
| Letter, to Charles T. Riggs, from Henry K. Wingate | Amerikan Bord Heyeti (American Board) | 1912-01-27 |
| Letter, to Charles T. Riggs, from Henry K. Wingate | Amerikan Bord Heyeti (American Board) | 1911-05-10 |
| Letter, to Charles T. Riggs, from Herbert M. Irwin | Amerikan Bord Heyeti (American Board) | 1912-07-27 |
| Letter, to Charles T. Riggs, from James P. McNaughton | Amerikan Bord Heyeti (American Board) | 1911-04-29 |
 | Letter, to Charles T. Riggs, from James P. McNaughton | Amerikan Bord Heyeti (American Board) | 1911-05-05 |
 | Letter, to Charles T. Riggs, from James R. Brewster | Amerikan Bord Heyeti (American Board) | 1913-03-07 |
| Letter, to Charles T. Riggs, from Mary C. Fowle | Amerikan Bord Heyeti (American Board) | 1911-08-23 |
 | Letter, to Charles T. Riggs, from Mrs.R. B. Cherrington | Amerikan Bord Heyeti (American Board) | 1911-08-08 |
| Letter, to Charles T. Riggs, from Ralph S. Harlow | Amerikan Bord Heyeti (American Board) | 1912-07-10 |
| 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 Laura Farnham | Amerikan Bord Heyeti (American Board) | 1910-05-07 |
