1Peter S. Du Ponceau to Thomas Jefferson, 6 January 1818 (Jefferson Papers)
American Philosophical Society, Historical and Literary Committee; and W. Byrd manuscripts [index...
2Peter S. Du Ponceau to Thomas Jefferson, 24 February 1818 (Jefferson Papers)
American Philosophical Society, Historical and Literary Committee; and W. Byrd manuscripts [index...
3Peter S. Du Ponceau to Thomas Jefferson, 5 December 1817 (Jefferson Papers)
American Philosophical Society, Historical and Literary Committee; and W. Byrd manuscripts [index...
4Peter S. Du Ponceau to Thomas Jefferson, 24 January 1818 (Jefferson Papers)
American Philosophical Society, Historical and Literary Committee; and W. Byrd manuscripts [index...
5Peter S. Du Ponceau to Thomas Jefferson, 17 February 1817 (Jefferson Papers)
American Philosophical Society, Historical and Literary Committee; and W. Byrd manuscripts [index...
6Thomas Jefferson to Peter S. Du Ponceau, 17 January 1818 (Jefferson Papers)
American Philosophical Society, Historical and Literary Committee; and W. Byrd manuscripts [index...
7Thomas Jefferson to Benjamin Harrison, 17 January 1818 (Jefferson Papers)
American Philosophical Society, Historical and Literary Committee; and W. Byrd manuscripts [index...
8Thomas Jefferson to Peter S. Du Ponceau, 19 February 1818 (Jefferson Papers)
American Philosophical Society, Historical and Literary Committee; and W. Byrd manuscripts [index...
9Thomas Jefferson to Wilson Cary Nicholas, 19 March 1817 (Jefferson Papers)
American Philosophical Society, Historical and Literary Committee; and W. Byrd manuscripts [index...
10Thomas Jefferson to Peter S. Du Ponceau, 6 November 1817 (Jefferson Papers)
American Philosophical Society, Historical and Literary Committee; and W. Byrd manuscripts [index...