1Thomas Jefferson to John Armstrong, 20 March 1818 (Jefferson Papers)
Armstrong, John; and proposed biography of T. Kosciuszko [index entry]
2John Armstrong to Thomas Jefferson, 1 July 1818 (Jefferson Papers)
Armstrong, John; and proposed biography of T. Kosciuszko [index entry]
3Thomas Jefferson to Marc Antoine Jullien, 23 July 1818 (Jefferson Papers)
Armstrong, John; and proposed biography of T. Kosciuszko [index entry]