1Thomas Jefferson to Wilson Cary Nicholas, 16 December 1809 (Jefferson Papers)
A Course of Experimental Agriculture (Young) [index entry]
2Enclosure: Thomas Jefferson’s Catalogue of Books on Agriculture, [ca. 16 December 1809] (Jefferson Papers)
A Course of Experimental Agriculture (Young) [index entry]
3Thomas Jefferson to Nicolas G. Dufief, 24 June 1813 (Jefferson Papers)
A Course of Experimental Agriculture (Young) [index entry]