1Julian Ursin Niemcewicz to Thomas Jefferson, 4 September 1810 (Jefferson Papers)
Kosciuszko, Tadeusz (Thaddeus) Andrzej Bonawentura; mentioned [index entry]
2Isaac Cox Barnet to Thomas Jefferson, 23 September 1817 (Jefferson Papers)
Kosciuszko, Tadeusz (Thaddeus) Andrzej Bonawentura; mentioned [index entry]