21Thomas Jefferson to James Walker, 11 January 1811 (Jefferson Papers)
agriculture; threshing machines [index entry]
22Thomas Jefferson to Joel Yancey, 7 June 1815 (Jefferson Papers)
agriculture; threshing machines [index entry]
23Thomas Jefferson to Joel Yancey, 12 May 1820 (Jefferson Papers)
agriculture; threshing machines [index entry]
24Thomas Jefferson’s Notes on Alexander Hepburn’s Poplar Forest Materials List, [ca. 8 October 1819] (Jefferson Papers)
agriculture; threshing machines [index entry]
25Memorandum by Thomas Eston Randolph, 23 July [August?] 1812 (Jefferson Papers)
agriculture; threshing machines [index entry]
26Alexander Hepburn’s List of Materials for Work at Poplar Forest [ca. 8 October 1819] (Jefferson Papers)
agriculture; threshing machines [index entry]
27Thomas Jefferson’s Calculation of Timber Needed by Alexander Hepburn at Poplar Forest, [ca. 8 October 1819] (Jefferson Papers)
agriculture; threshing machines [index entry]
28Thomas Jefferson’s Constitution for Proposed Agricultural Society of Albemarle, [ca. 1 February 1811] (Jefferson Papers)
agriculture; threshing machines [index entry]