David Rumsey
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Website
Frost Occurrences. Atlas of American Agriculture.
5797.029
pilot4
Weather Maps Showing Conditions Favorable for Frost. Number of Times in 20 Years 1895-1914 the Last Killing Frost in Spring was 10 Days or more later than the Average Date. Atlas of American Agriculture. FJM.
1916
1936
Reed, William Gardner
U.S. Department of Agriculture
62 × 48 cm