1Peter S. Du Ponceau to Thomas Jefferson, 8 February 1816 (Jefferson Papers)
American Philosophical Society, Historical and Literary Committee; TJ sends works to [index entry]
2Thomas Jefferson to Peter S. Du Ponceau, 22 January 1816 (Jefferson Papers)
American Philosophical Society, Historical and Literary Committee; TJ sends works to [index entry]
3Thomas Jefferson to Peter S. Du Ponceau, 26 January 1817 (Jefferson Papers)
American Philosophical Society, Historical and Literary Committee; TJ sends works to [index entry]