1John Vaughan to Thomas Jefferson, 12 February 1818 (Jefferson Papers)
Tilghman, William; and American Philosophical Society [index entry]
2William Tilghman to Thomas Jefferson, 26 March 1818 (Jefferson Papers)
Tilghman, William; and American Philosophical Society [index entry]
3Enclosure: Nicholas Biddle to William Tilghman, 6 April 1818 (Jefferson Papers)
Tilghman, William; and American Philosophical Society [index entry]