1Enclosure: Destutt de Tracy to Pierre Samuel Du Pont de Nemours, 30 January 1816 (Jefferson Papers)
A Treatise on Political Economy (Destutt de Tracy) [index entry]
2Thomas Jefferson to Pierre Samuel Du Pont de Nemours, 3 August 1816 (Jefferson Papers)
A Treatise on Political Economy (Destutt de Tracy) [index entry]