1Thomas Jefferson to Nathaniel Chapman, 11 December 1809 (Jefferson Papers)
Jefferson, Thomas; Writings; Weather Memorandum Book [index entry]
2Thomas Jefferson to David Bailie Warden, 8 July 1811 (Jefferson Papers)
Jefferson, Thomas; Writings; Weather Memorandum Book [index entry]
3Thomas Jefferson to Joseph Slaughter, 17 May 1812 (Jefferson Papers)
Jefferson, Thomas; Writings; Weather Memorandum Book [index entry]
4Thomas Jefferson to Patrick Gibson, 21 January 1813 (Jefferson Papers)
Jefferson, Thomas; Writings; Weather Memorandum Book [index entry]