1Thomas Jefferson to Thomas Cooper, 25 November 1817 (Jefferson Papers)
Pennsylvania, University of [index entry]
2Thomas Jefferson to Thomas Cooper, 6 February 1818 (Jefferson Papers)
Pennsylvania, University of [index entry]
3Thomas Jefferson to Thomas Cooper, 11 April 1818 (Jefferson Papers)
Pennsylvania, University of [index entry]
4Thomas Jefferson to Thomas Cooper, 7 August 1818 (Jefferson Papers)
Pennsylvania, University of [index entry]