David Rumsey
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Website
Average Dates of First Killing Frosts in Fall. Atlas of American Agriculture.
5797.030
pilot4
Average Dates of First Killing Frosts in Fall. (inset) First Killing Frost in Fall, 1914. Atlas of American Agriculture.
1916
1936
Brooks, Charles Franklin
U.S. Department of Agriculture
62 × 48 cm
1 : 8000000