1To Benjamin Franklin from William Alexander, [19 March 1780] (Franklin Papers)
...Pennsylvania, University of Pennsylvania Library, Library of Congress, Pendleton...
2Thomas Jefferson to Adamo Fabbroni, Antoine Gouan, Lacepede, Marc Auguste Pictet, and André Thoüin, 6 March 1815 (Jefferson Papers)
Pennsylvania, University of [index entry]
3Samuel Carr to Thomas Jefferson, 1 February 1819 (Jefferson Papers)
Pennsylvania, University of [index entry]
4Thomas Cooper to Thomas Jefferson, 13 [March] 1819 (Jefferson Papers)
Pennsylvania, University of [index entry]
5Thomas Cooper to Thomas Jefferson, 23 January 1818 (Jefferson Papers)
Pennsylvania, University of [index entry]
6Thomas Cooper to Thomas Jefferson, 1 September 1818 (Jefferson Papers)
Pennsylvania, University of [index entry]
7Thomas Cooper to Thomas Jefferson, 20 February 1818 (Jefferson Papers)
Pennsylvania, University of [index entry]
8Thomas Cooper to Thomas Jefferson, 3 September 1818 (Jefferson Papers)
Pennsylvania, University of [index entry]
9Thomas Cooper to Thomas Jefferson, 20 November 1817 (Jefferson Papers)
Pennsylvania, University of [index entry]
10Thomas Cooper to Thomas Jefferson, 2 September 1818 (Jefferson Papers)
Pennsylvania, University of [index entry]