1Amos Hamlin to Thomas Jefferson, 12 January 1818 (Jefferson Papers)
meteorological observations; by A. Hamlin [index entry]
2Enclosure: Amos Hamlin’s Meteorological Observations, [by 12 January 1818] (Jefferson Papers)
meteorological observations; by A. Hamlin [index entry]
3Thomas Jefferson to Amos Hamlin, 1 April 1818 (Jefferson Papers)
meteorological observations; by A. Hamlin [index entry]