1Robert Walsh to Thomas Jefferson, 27 January 1818 (Jefferson Papers)
Correspondance littéraire, philosophique et critique (F. M. Grimm) [index entry]
2Robert Walsh to Thomas Jefferson, 12 March 1818 (Jefferson Papers)
Correspondance littéraire, philosophique et critique (F. M. Grimm) [index entry]
3Robert Walsh to Thomas Jefferson, 1 August 1818 (Jefferson Papers)
Correspondance littéraire, philosophique et critique (F. M. Grimm) [index entry]