21Timothy Pickering to Thomas Jefferson, 12 February 1821 (Jefferson Papers)
American Philosophical Society; members of [index entry]
22Thomas P. Jones to Thomas Jefferson, 5 March 1821 (Jefferson Papers)
American Philosophical Society; members of [index entry]
23Thomas Jefferson to Lewis Cass, 31 May 1821 (Jefferson Papers)
American Philosophical Society; members of [index entry]
24William James Macneven to Thomas Jefferson, 18 December 1821 (Jefferson Papers)
American Philosophical Society; members of [index entry]
25John D. Godman and John P. Foote to Thomas Jefferson, 6 March 1822 (Jefferson Papers)
American Philosophical Society; members of [index entry]
26William H. Keating to Thomas Jefferson, 1 July 1822 (Jefferson Papers)
American Philosophical Society; members of [index entry]