1981. United States, Soil Conservation Service, Michigan State University, and Center for Remote Sensing. Extent: 1 map Notes: Includes notes and location map. Scale 1:50,000. Soil Conservation Service.
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1981. United States. Soil Conservation Service. Interpretations derived from soil map constructed 1966 by Cartographic Division, Soil Conservation Service, USDA, of Ionia County, Michigan and Cen... The Service (Washington, D.C.?).