1Thomas Jefferson to Lewis Cass, 31 May 1821 (Jefferson Papers)
American Philosophical Society; members of [index entry]
2Thomas Jefferson to Tench Coxe, 13 October 1820 (Jefferson Papers)
American Philosophical Society; members of [index entry]
3Thomas Jefferson to Antonio Dugnani, 14 February 1818 (Jefferson Papers)
American Philosophical Society; members of [index entry]
4Peter S. Du Ponceau to Thomas Jefferson, 11 December 1817 (Jefferson Papers)
American Philosophical Society; members of [index entry]
5Petty Vaughan to Thomas Jefferson, 29 March 1819 (Jefferson Papers)
American Philosophical Society; members of [index entry]
6William James Macneven to Thomas Jefferson, 18 December 1821 (Jefferson Papers)
American Philosophical Society; members of [index entry]
7Julius T. Ducatel to Thomas Jefferson, 3 August 1818 (Jefferson Papers)
American Philosophical Society; members of [index entry]
8Peter S. Du Ponceau to Thomas Jefferson, 9 October 1820 (Jefferson Papers)
American Philosophical Society; members of [index entry]
9William H. Keating to Thomas Jefferson, 1 July 1822 (Jefferson Papers)
American Philosophical Society; members of [index entry]
10William S. Jacobs to Thomas Jefferson, 3 July 1818 (Jefferson Papers)
American Philosophical Society; members of [index entry]