1Thomas Jefferson to Nicolas G. Dufief, [18] September 1813 (Jefferson Papers)
Coppinger, Joseph; The American Practical Brewer and Tanner [index entry]
2Thomas Jefferson to Nicolas G. Dufief, 7 November 1813 (Jefferson Papers)
Coppinger, Joseph; The American Practical Brewer and Tanner [index entry]
3Thomas Jefferson to Nicolas G. Dufief, 20 March 1814 (Jefferson Papers)
Coppinger, Joseph; The American Practical Brewer and Tanner [index entry]