1Thomas Jefferson to Destutt de Tracy, 15 May 1817 (Jefferson Papers)
A Treatise on Political Economy (Destutt de Tracy) [index entry]
2Thomas Jefferson to Destutt de Tracy, 24 November 1818 (Jefferson Papers)
A Treatise on Political Economy (Destutt de Tracy) [index entry]
3Thomas Jefferson to Destutt de Tracy, 26 December 1820 (Jefferson Papers)
A Treatise on Political Economy (Destutt de Tracy) [index entry]