1Peter S. Du Ponceau to Thomas Jefferson, 5 January 1818 (Jefferson Papers)
American Philosophical Society; and election of officers [index entry]
2Robert M. Patterson to Thomas Jefferson, 23 January 1818 (Jefferson Papers)
American Philosophical Society; and election of officers [index entry]
3Thomas Jefferson to Robert M. Patterson, 15 February 1818 (Jefferson Papers)
American Philosophical Society; and election of officers [index entry]