1Nicolas G. Dufief to Thomas Jefferson, 29 September 1813 (Jefferson Papers)
The American Practical Brewer and Tanner (J. Coppinger) [index entry]
2Nicolas G. Dufief to Thomas Jefferson, 26 November 1813 (Jefferson Papers)
The American Practical Brewer and Tanner (J. Coppinger) [index entry]
3Nicolas G. Dufief to Thomas Jefferson, 6 April 1814 (Jefferson Papers)
The American Practical Brewer and Tanner (J. Coppinger) [index entry]
4Nicolas G. Dufief to Thomas Jefferson, 14 April 1814 (Jefferson Papers)
The American Practical Brewer and Tanner (J. Coppinger) [index entry]