1Thomas Jefferson to Nicolas G. Dufief, [18] September 1813 (Jefferson Papers)
The American Practical Brewer and Tanner (J. Coppinger) [index entry]
2Thomas Jefferson to Nicolas G. Dufief, 7 November 1813 (Jefferson Papers)
The American Practical Brewer and Tanner (J. Coppinger) [index entry]
3Thomas Jefferson to Nicolas G. Dufief, 20 March 1814 (Jefferson Papers)
The American Practical Brewer and Tanner (J. Coppinger) [index entry]
4Thomas Jefferson to Joseph Coppinger, 25 April 1815 (Jefferson Papers)
The American Practical Brewer and Tanner (J. Coppinger) [index entry]