1Thomas Jefferson to Benjamin B. Ford, 28 November 1809 (Jefferson Papers)
machines; threshing [index entry]
2Thomas Jefferson to Jeremiah A. Goodman, 17 June 1813 (Jefferson Papers)
machines; threshing [index entry]
3Thomas Jefferson to Jeremiah A. Goodman, 6 January 1815 (Jefferson Papers)
machines; threshing [index entry]
4Thomas Jefferson to Cunningham Harris, 6 November 1812 (Jefferson Papers)
machines; threshing [index entry]
5Thomas Jefferson to Alexander Hepburn, 7 August 1819 (Jefferson Papers)
machines; threshing [index entry]
6Thomas Jefferson to Alexander Hepburn, 20 May 1820 (Jefferson Papers)
machines; threshing [index entry]
7Joel Yancey to Thomas Jefferson, 8 October 1819 (Jefferson Papers)
machines; threshing [index entry]
8Joel Yancey to Thomas Jefferson, 14 October 1819 (Jefferson Papers)
machines; threshing [index entry]
9Benjamin B. Ford to Thomas Jefferson, 17 November 1809 (Jefferson Papers)
machines; threshing [index entry]
10Charles Willson Peale to Thomas Jefferson, 28 December 1813 (Jefferson Papers)
machines; threshing [index entry]