1Thomas Jefferson to Joseph Milligan, 6 April 1816 (Jefferson Papers)
Destutt de Tracy, Antoine Louis Claude; TJ onTreatise [index entry]
2Thomas Jefferson to Francis W. Gilmer, 7 June 1816 (Jefferson Papers)
Destutt de Tracy, Antoine Louis Claude; TJ onTreatise [index entry]
3Thomas Jefferson to Pierre Samuel Du Pont de Nemours, 3 August 1816 (Jefferson Papers)
Destutt de Tracy, Antoine Louis Claude; TJ onTreatise [index entry]
4Thomas Jefferson to Lafayette, 8 March 1819 (Jefferson Papers)
Destutt de Tracy, Antoine Louis Claude; TJ onTreatise [index entry]