1Peter S. Du Ponceau to Thomas Jefferson, 11 December 1817 (Jefferson Papers)
American Philosophical Society, Historical and Literary Committee; activities of [index entry]
2Peter S. Du Ponceau to Thomas Jefferson, 6 January 1818 (Jefferson Papers)
American Philosophical Society, Historical and Literary Committee; activities of [index entry]
3Peter S. Du Ponceau to Thomas Jefferson, 22 January 1818 (Jefferson Papers)
American Philosophical Society, Historical and Literary Committee; activities of [index entry]
4Peter S. Du Ponceau to Thomas Jefferson, 14 April 1818 (Jefferson Papers)
American Philosophical Society, Historical and Literary Committee; activities of [index entry]