1Peter Poinsot to Thomas Jefferson, 25 June 1817 (Jefferson Papers)
French language; letters in, from; P. Poinsot [index entry]
2Peter Poinsot to Thomas Jefferson, 18 May 1818 (Jefferson Papers)
French language; letters in, from; P. Poinsot [index entry]
3Peter Poinsot to Thomas Jefferson, 12 September 1818 (Jefferson Papers)
French language; letters in, from; P. Poinsot [index entry]
4Peter Poinsot to Thomas Jefferson, 24 June 1820 (Jefferson Papers)
French language; letters in, from; P. Poinsot [index entry]