 | Letter, from Justin W. Parsons | Amerikan Bord Heyeti (American Board) | 1862 |
 | Letter, Sivas Normal School, by Ernest C. Partridge, Principal | Amerikan Bord Heyeti (American Board) | 1909-04-03 |
| Letter, to Charles T. Riggs, from ? | Amerikan Bord Heyeti (American Board) | 1911-02-06 |
| Letter, to Charles T. Riggs, from A.R. Hoover | Amerikan Bord Heyeti (American Board) | 1911-02 |
 | Letter, to Charles T. Riggs, from Charlotte R. Willard | Amerikan Bord Heyeti (American Board) | 1912-02-24 |
| Letter, to Charles T. Riggs, from Dana K. Getchell | Amerikan Bord Heyeti (American Board) | 1911-05-19 |
 | Letter, to Charles T. Riggs, from Edward Riggs | Amerikan Bord Heyeti (American Board) | 1912-02-02 |
 | Letter, to Charles T. Riggs, from Emily M. McCallum | Amerikan Bord Heyeti (American Board) | 1912-06-14 |
 | Letter, to Charles T. Riggs, from Ernest C. Partridge | Amerikan Bord Heyeti (American Board) | 1912-04-18 |
 | Letter, to Charles T. Riggs, from Ernest C. Partridge | Amerikan Bord Heyeti (American Board) | 1913-05-10 |
 | 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 Ernest C. Partridge | Amerikan Bord Heyeti (American Board) | 1912-02-03 |
 | 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) | 1912-12-19 |
 | 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) | 1912-03-30 |
