1Thomas A. Digges to Thomas Jefferson, 30 May 1818 (Jefferson Papers)
Great Britain; wheat in [index entry]
2Fontaine Maury to Thomas Jefferson, 14 February 1819 (Jefferson Papers)
Great Britain; wheat in [index entry]
3Enclosure: Observations on Talavera Wheat by an Unidentified Gentleman, 20 September 1818 (Jefferson Papers)
Great Britain; wheat in [index entry]