David Rumsey
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Monthly (February, March, April) Precipitation. Atlas of American Agriculture.
5797.044
pilot4
Average Monthly (February, March, April) Precipitation in Inches. Average Number of Days with Precipitation. Atlas of American Agriculture. FJM.
1922
1936
Kincer, Joseph Burton
U.S. Department of Agriculture
62 × 48 cm
1 : 17000000