1Thomas Jefferson to John Armstrong, 6 March 1809 (Jefferson Papers)
plows.; Guillaume [index entry]
2Thomas Jefferson to Joel Barlow, 31 December 1809 (Jefferson Papers)
plows.; Guillaume [index entry]
3Thomas Jefferson to Joel Barlow, 24 January 1810 (Jefferson Papers)
plows.; Guillaume [index entry]
4Thomas Jefferson to James Madison, 25 March 1810 (Jefferson Papers)
plows.; Guillaume [index entry]
5Thomas Jefferson to Robert Fulton, 16 April 1810 (Jefferson Papers)
plows.; Guillaume [index entry]
6Enclosure: Thomas Jefferson’s Membership Diploma in the Agricultural Society of Bavaria, 13 February 1812 (Jefferson Papers)
plows.; Guillaume [index entry]