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You are looking at an extraordinary map of General soil map, Des Moines River Basin, Iowa, Minnesota, and Missouri / U.S. Department of Agriculture Soil Conservation Service. It was taken in 1980.
Soils.
"3-14-80." "Source: Family of maps SCS drwg no. 5,R-36,523 (9-78) and information from SCS field personnel." Includes descriptive index to soil associations and location map. "5,S-37,691." Scale [ca. 1:1,200,000] ; Lambert conformal conic proj. (W 970--W 910/N 450--N 400).
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