1Thomas Jefferson to John Breck Treat, 30 November 1809 (Jefferson Papers)
American Philosophical Society; and J. B. Treat [index entry]
2William C. C. Claiborne to Thomas Jefferson, 12 January 1810 (Jefferson Papers)
American Philosophical Society; and J. B. Treat [index entry]
3Thomas Jefferson to John Breck Treat, 16 February 1810 (Jefferson Papers)
American Philosophical Society; and J. B. Treat [index entry]