11Charles Willson Peale to Thomas Jefferson, 19 August 1812 (Jefferson Papers)
agriculture; threshing machines [index entry]
12Joel Yancey to Thomas Jefferson, 26 September 1819 (Jefferson Papers)
agriculture; threshing machines [index entry]
13Charles Willson Peale to Thomas Jefferson, 2 May 1815 (Jefferson Papers)
agriculture; threshing machines [index entry]
14Thomas Jefferson to James Madison, 9 August 1810 (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 to Charles Willson Peale, 8 May 1816 (Jefferson Papers)
agriculture; threshing machines [index entry]
17Thomas Jefferson to Charles Willson Peale, 13 June 1815 (Jefferson Papers)
agriculture; threshing machines [index entry]
18Thomas Jefferson to John H. Peyton, 17 December 1819 (Jefferson Papers)
agriculture; threshing machines [index entry]
19Thomas Jefferson to Charles A. Scott, 9 February 1811 (Jefferson Papers)
agriculture; threshing machines [index entry]
20Thomas Jefferson to Archibald Thweatt, 16 March 1817 (Jefferson Papers)
agriculture; threshing machines [index entry]