11Thomas Jefferson to James Walker, 11 January 1811 (Jefferson Papers)
agriculture; threshing machines [index entry]
12Thomas Jefferson to Joel Yancey, 7 June 1815 (Jefferson Papers)
agriculture; threshing machines [index entry]
13Thomas Jefferson to Joel Yancey, 12 May 1820 (Jefferson Papers)
agriculture; threshing machines [index entry]
14Thomas Jefferson to Alexander Hepburn, 20 May 1820 (Jefferson Papers)
agriculture; threshing machines [index entry]
15Thomas Jefferson to Charles Willson Peale, 21 March 1815 (Jefferson Papers)
agriculture; threshing machines [index entry]
16Thomas Jefferson’s Calculation of Timber Needed by Alexander Hepburn at Poplar Forest, [ca. 8 October 1819] (Jefferson Papers)
agriculture; threshing machines [index entry]
17Thomas Jefferson to Charles A. Scott, 9 February 1811 (Jefferson Papers)
agriculture; threshing machines [index entry]
18Thomas Jefferson to Benjamin B. Ford, 28 November 1809 (Jefferson Papers)
agriculture; threshing machines [index entry]
19Thomas Jefferson to Charles Willson Peale, 8 May 1816 (Jefferson Papers)
agriculture; threshing machines [index entry]
20Thomas Jefferson to Charles Willson Peale, 13 June 1815 (Jefferson Papers)
agriculture; threshing machines [index entry]