1Joel Yancey to Thomas Jefferson, 26 September 1819 (Jefferson Papers)
agriculture; threshing machines [index entry]
2Joel Yancey to Thomas Jefferson, 8 October 1819 (Jefferson Papers)
agriculture; threshing machines [index entry]
3Joel Yancey to Thomas Jefferson, 14 October 1819 (Jefferson Papers)
agriculture; threshing machines [index entry]