1981. United States. Soil Conservation Service. Shows land use.; "Interpretations derived from soil map constructed in 1977 by Cartographic Division, Soil Conservation Service, USDA, of Delta Cou... The Service (Washington, D.C.?).
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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.?).
1981. United States. Soil Conservation Service. Shows land use.; "Interpretations derived from soil map constructed by Cartographic Division, Soil Conservation Service, USDA, of Lenawee County, M... The Service (Washington, D.C.?).