1Thomas Jefferson to Marc Antoine Jullien, 23 July 1818 (Jefferson Papers)
2Thomas Jefferson to Franz X. Zeltner, 23 July 1818 (Jefferson Papers)
3Thomas Jefferson to John Armstrong, 14 March 1819 (Jefferson Papers)
4Franz X. Zeltner to Thomas Jefferson, 14 April 1819 (Jefferson Papers)
5Thomas Jefferson to William Wirt, 27 June 1819 (Jefferson Papers)
6John Armstrong to Thomas Jefferson, 6 November 1819 (Jefferson Papers)
7Benjamin L. Lear to Thomas Jefferson, 19 September 1821 (Jefferson Papers)