1Benjamin B. Ford to Thomas Jefferson, 17 November 1809 (Jefferson Papers)
machines; threshing [index entry]
2Charles Willson Peale to Thomas Jefferson, 19 August 1812 (Jefferson Papers)
machines; threshing [index entry]
3Cunningham Harris to Thomas Jefferson, 30 September 1812 (Jefferson Papers)
machines; threshing [index entry]
4Charles Willson Peale to Thomas Jefferson, 28 December 1813 (Jefferson Papers)
machines; threshing [index entry]
5Charles Willson Peale to Thomas Jefferson, 2 May 1815 (Jefferson Papers)
machines; threshing [index entry]
6Joel Yancey to Thomas Jefferson, 26 September 1819 (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]