1Thomas Jefferson to John C. Calhoun, 31 December 1817 (Jefferson Papers)
2John C. Calhoun to Thomas Jefferson, 13 January 1818 (Jefferson Papers)
3Thomas Jefferson to John C. Calhoun, 20 July 1818 (Jefferson Papers)
4Thomas Jefferson to Lafayette, 23 November 1818 (Jefferson Papers)
5Thomas Jefferson to John C. Calhoun, 27 November 1818 (Jefferson Papers)
6Thomas Jefferson to Lafayette, 8 March 1819 (Jefferson Papers)
7Thomas Jefferson to Joseph Léonard Poirey, 8 March 1819 (Jefferson Papers)
8Thomas Jefferson to John C. Calhoun, 4 April 1819 (Jefferson Papers)
9Thomas Jefferson to Lafayette, 26 December 1820 (Jefferson Papers)