1Thomas Jefferson to Arthur S. Brockenbrough, 1 September [1819] (Jefferson Papers)
Vaughan, John; and University of Virginia [index entry]
2Thomas Cooper to Thomas Jefferson, 13 September 1819 (Jefferson Papers)
Vaughan, John; and University of Virginia [index entry]
3Thomas Jefferson to John Vaughan, 14 February 1820 (Jefferson Papers)
Vaughan, John; and University of Virginia [index entry]
4Thomas Jefferson to John Vaughan, 15 February 1820 (Jefferson Papers)
Vaughan, John; and University of Virginia [index entry]