1Thomas Jefferson to John Adams, 14 October 1816 (Jefferson Papers)
2Thomas Jefferson to John Adams, 25 November 1816 (Jefferson Papers)
3Destutt de Tracy to Thomas Jefferson, 24 December 1816 (Jefferson Papers)
4Thomas Jefferson to Destutt de Tracy, 15 May 1817 (Jefferson Papers)
5Thomas Jefferson to Robert Walsh, 9 January 1818 (Jefferson Papers)
6Robert Walsh to Thomas Jefferson, 27 January 1818 (Jefferson Papers)
7Thomas Jefferson to Robert Walsh, 19 February 1818 (Jefferson Papers)
8Robert Walsh to Thomas Jefferson, 12 March 1818 (Jefferson Papers)
9Destutt de Tracy to Thomas Jefferson, 11 April 1818 (Jefferson Papers)
10Robert Walsh to Thomas Jefferson, 20 April 1818 (Jefferson Papers)