| Letter, to Rufus Anderson, from Henry J. Van Lennep | Amerikan Bord Heyeti (American Board) | 1866-07-28 |
| Letter, to N.G. Clark, from Elias Riggs (on missionary to Greeks) | Amerikan Bord Heyeti (American Board) | 1866-09-20 |
| Letter, to N.G. Clark, from George Washburn | Amerikan Bord Heyeti (American Board) | 1868-01-13 |
| Letter, to N.G. Clark, from Elias Riggs and Ira F. Pettibone | Amerikan Bord Heyeti (American Board) | 1869-04-05 |
| Letter, to N.G. Clark, from Harrison G.O. Dwight | Amerikan Bord Heyeti (American Board) | 1877-11-16 |
| Letter, to N.G. Clark, from William F. Williams | Amerikan Bord Heyeti (American Board) | 1868-07-25 |
| Letter, to N.G. Clark | Amerikan Bord Heyeti (American Board) | 1876-06-12 |
| Letter, to Theodore A. Baldwin, from William G. Schauffler | Amerikan Bord Heyeti (American Board) | 1877-02-19 |
| Letter, to Theodore A. Baldwin, from Caroline R. Wheeler Allen | Amerikan Bord Heyeti (American Board) | 1877-05-11 |
| Letter, to Theodore A. Baldwin, from William G. Schauffler | Amerikan Bord Heyeti (American Board) | 1877-03-31 |
