1Thomas Jefferson to Destutt de Tracy, 28 November 1813 (Jefferson Papers)
Élémens d’Idéologie (Destutt de Tracy); preparation of [index entry]
2William Duane to Thomas Jefferson, 11 August 1814 (Jefferson Papers)
Élémens d’Idéologie (Destutt de Tracy); preparation of [index entry]
3Destutt de Tracy to Thomas Jefferson, 4 February 1816 (Jefferson Papers)
Élémens d’Idéologie (Destutt de Tracy); preparation of [index entry]