1John Breck Treat to Thomas Jefferson, 31 March 1809 (Jefferson Papers)
Treat, John Breck; journal of Arkansas meteorological observations [index entry]
2Thomas Jefferson to Robert Patterson, 31 August 1809 (Jefferson Papers)
Treat, John Breck; journal of Arkansas meteorological observations [index entry]
3Thomas T. Hewson to Thomas Jefferson, 20 October 1809 (Jefferson Papers)
Treat, John Breck; journal of Arkansas meteorological observations [index entry]
4Thomas Jefferson to John Breck Treat, 30 November 1809 (Jefferson Papers)
Treat, John Breck; journal of Arkansas meteorological observations [index entry]
5William C. C. Claiborne to Thomas Jefferson, 12 January 1810 (Jefferson Papers)
Treat, John Breck; journal of Arkansas meteorological observations [index entry]
6John Breck Treat to Thomas Jefferson, 5 February 1810 (Jefferson Papers)
Treat, John Breck; journal of Arkansas meteorological observations [index entry]
7Thomas Jefferson to John Breck Treat, 16 February 1810 (Jefferson Papers)
Treat, John Breck; journal of Arkansas meteorological observations [index entry]