1To Thomas Jefferson from Thomas Pinckney, 10 February 1793 (Jefferson Papers)
...inquiries I have found one of the threshing Machines at no great distance from this City....
2To Thomas Jefferson from Thomas Pinckney, 13 March 1793 (Jefferson Papers)
...by Mr. Marshall the model of a threshing machine which a mechanic promised to finish by...
3To Thomas Jefferson from Thomas Pinckney, 10 June 1793 (Jefferson Papers)
...of forwarding to you the model of the threshing machine which I have been so long in getting...
4To Thomas Jefferson from Thomas Pinckney, with Jefferson’s Note, 29 January 1794 (Jefferson Papers)
.... which is duly honor’d. I wish the threshing machine may answer the purpose, I have no doubt...