1Thomas Jefferson to Archibald Thweatt, 16 March 1817 (Jefferson Papers)
agriculture; threshing machines [index entry]
2Thomas Jefferson to Alexander Hepburn, 7 August 1819 (Jefferson Papers)
agriculture; threshing machines [index entry]
3Joel Yancey to Thomas Jefferson, 26 September 1819 (Jefferson Papers)
agriculture; threshing machines [index entry]
4Alexander Hepburn’s List of Materials for Work at Poplar Forest [ca. 8 October 1819] (Jefferson Papers)
agriculture; threshing machines [index entry]
5Thomas Jefferson’s Notes on Alexander Hepburn’s Poplar Forest Materials List, [ca. 8 October 1819] (Jefferson Papers)
agriculture; threshing machines [index entry]
6Thomas Jefferson’s Calculation of Timber Needed by Alexander Hepburn at Poplar Forest, [ca. 8 October 1819] (Jefferson Papers)
agriculture; threshing machines [index entry]
7Joel Yancey to Thomas Jefferson, 8 October 1819 (Jefferson Papers)
agriculture; threshing machines [index entry]
8Joel Yancey to Thomas Jefferson, 14 October 1819 (Jefferson Papers)
agriculture; threshing machines [index entry]
9Thomas Jefferson to John H. Peyton, 17 December 1819 (Jefferson Papers)
agriculture; threshing machines [index entry]
10Thomas Jefferson to Joel Yancey, 12 May 1820 (Jefferson Papers)
agriculture; threshing machines [index entry]