1Thomas Jefferson to Wilson Cary Nicholas, 5 April 1818 (Jefferson Papers)
2Thomas Jefferson to Patrick Gibson, 10 April 1818 (Jefferson Papers)
3Thomas Jefferson to Patrick Gibson, 11 June 1818 (Jefferson Papers)
4Thomas Jefferson to Patrick Gibson, 22 February 1819 (Jefferson Papers)
5Thomas Jefferson to Patrick Gibson, 11 April 1819 (Jefferson Papers)
6Thomas Jefferson to Patrick Gibson, 22 April 1819 (Jefferson Papers)
7Patrick Gibson to Thomas Jefferson, 12 May 1819 (first letter) (Jefferson Papers)
8Thomas Jefferson to Patrick Gibson, 14 May 1819 (Jefferson Papers)
9Thomas Jefferson to Patrick Gibson, 28 July 1819 (Jefferson Papers)
10Thomas Jefferson to Patrick Gibson, 11 August 1819 (Jefferson Papers)