1Destutt de Tracy to Thomas Jefferson, 29 August 1813 (Jefferson Papers)
Destutt de Tracy, Antoine Louis Claude; and American Philosophical Society [index entry]
2Enclosure: Destutt de Tracy to Pierre Samuel Du Pont de Nemours, 30 January 1816 (Jefferson Papers)
Destutt de Tracy, Antoine Louis Claude; and American Philosophical Society [index entry]
3Thomas Jefferson to Destutt de Tracy, 26 December 1820 (Jefferson Papers)
Destutt de Tracy, Antoine Louis Claude; and American Philosophical Society [index entry]