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