1Thomas Jefferson to Destutt de Tracy, 24 November 1818 (Jefferson Papers)
Duane, William; and Destutt de Tracy’s works [index entry]
2Thomas Jefferson to Isaac H. Tiffany, 4 April 1819 (Jefferson Papers)
Duane, William; and Destutt de Tracy’s works [index entry]
3Thomas Jefferson to Destutt de Tracy, 26 December 1820 (Jefferson Papers)
Duane, William; and Destutt de Tracy’s works [index entry]