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]
3Peter S. Du Ponceau to Thomas Jefferson, 14 November 1815 (Jefferson Papers)
Tilghman, William; and American Philosophical Society [index entry]
4Enclosure: Nicholas Biddle to William Tilghman, 6 April 1818 (Jefferson Papers)
Tilghman, William; and American Philosophical Society [index entry]