1Thomas Jefferson: Analysis of Weather Memorandum Book, January 1817 (Jefferson Papers)
springs; temperature of as climate indicator [index entry]
2Thomas Jefferson to Amos Hamlin, 1 April 1818 (Jefferson Papers)
springs; temperature of as climate indicator [index entry]
3Enclosure: Thomas Jefferson’s Summary of Weather Observations, 1810–1816, [ca. 11 April 1818] (Jefferson Papers)
springs; temperature of as climate indicator [index entry]