 | Letter, to Charles T. Riggs, from Ernest C. Partridge | Amerikan Bord Heyeti (American Board) | 1912-03-02 |
 | Letter, to Charles T. Riggs, from Ernest Pye | Amerikan Bord Heyeti (American Board) | 1913-03-01 |
 | Letter, to Charles T. Riggs, from Ernest Pye | Amerikan Bord Heyeti (American Board) | 1913-01-30 |
 | Letter, to Charles T. Riggs, from Esther B. Robbins White | Amerikan Bord Heyeti (American Board) | 1911-05-17 |
 | Letter, to Charles T. Riggs, from F.M. Stead | Amerikan Bord Heyeti (American Board) | 1911-05-29 |
 | Letter, to Charles T. Riggs, from Fred F. Goodsell | Amerikan Bord Heyeti (American Board) | 1912-01-16 |
 | Letter, to Charles T. Riggs, from Fred F. Goodsell | Amerikan Bord Heyeti (American Board) | 1912-03-30 |
 | Letter, to Charles T. Riggs, from George E. White | Amerikan Bord Heyeti (American Board) | 1912-05-25 |
| Letter, to Charles T. Riggs, from H. T. Perry | Amerikan Bord Heyeti (American Board) | 1910-10-24 |
| Letter, to Charles T. Riggs, from H. T. Perry | Amerikan Bord Heyeti (American Board) | 1910-10-22 |
 | Letter, to Charles T. Riggs, from H. T. Perry | Amerikan Bord Heyeti (American Board) | 1910-10-31 |
 | Letter, to Charles T. Riggs, from H.S. Alexacian | Amerikan Bord Heyeti (American Board) | 1911-06-26 |
 | Letter, to Charles T. Riggs, from Henry K. Wingate | Amerikan Bord Heyeti (American Board) | 1911-04-08 |
 | Letter, to Charles T. Riggs, from Henry K. Wingate | Amerikan Bord Heyeti (American Board) | 1910-11-23 |
| 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) | 1911-04-03 |
| Letter, to Charles T. Riggs, from Henry K. Wingate | Amerikan Bord Heyeti (American Board) | 1912-01-27 |
| Letter, to Charles T. Riggs, from Herbert M. Irwin | Amerikan Bord Heyeti (American Board) | 1913-02-28 |
| Letter, to Charles T. Riggs, from Herbert M. Irwin | Amerikan Bord Heyeti (American Board) | 1912-07-27 |
 | Letter, to Charles T. Riggs, from J.K. Marden, Anatolia Hospital | Amerikan Bord Heyeti (American Board) | 1911-11-22 |
