1Peter S. Du Ponceau to Thomas Jefferson, 14 November 1815 (Jefferson Papers)
American Philosophical Society, Historical and Literary Committee; formation of [index entry]
2Thomas Jefferson to Peter S. Du Ponceau, 22 January 1816 (Jefferson Papers)
American Philosophical Society, Historical and Literary Committee; formation of [index entry]
3Peter S. Du Ponceau to Thomas Jefferson, 8 February 1816 (Jefferson Papers)
American Philosophical Society, Historical and Literary Committee; formation of [index entry]