11Thomas Jefferson to James Madison, 9 August 1810 (Jefferson Papers)
machines; threshing [index entry]
12Joel Yancey to Thomas Jefferson, 14 October 1819 (Jefferson Papers)
machines; threshing [index entry]
13Thomas Jefferson to Alexander Hepburn, 20 May 1820 (Jefferson Papers)
machines; threshing [index entry]
14Benjamin B. Ford to Thomas Jefferson, 17 November 1809 (Jefferson Papers)
machines; threshing [index entry]
15Thomas Jefferson’s Notes on Alexander Hepburn’s Poplar Forest Materials List, [ca. 8 October 1819] (Jefferson Papers)
machines; threshing [index entry]
16Thomas Jefferson to John H. Peyton, 17 December 1819 (Jefferson Papers)
machines; threshing [index entry]
17Thomas Jefferson to Archibald Thweatt, 16 March 1817 (Jefferson Papers)
machines; threshing [index entry]
18Thomas Jefferson to James Walker, 11 January 1811 (Jefferson Papers)
machines; threshing [index entry]
19Charles Willson Peale to Thomas Jefferson, 28 December 1813 (Jefferson Papers)
machines; threshing [index entry]
20Charles Willson Peale to Thomas Jefferson, 19 August 1812 (Jefferson Papers)
machines; threshing [index entry]