1979. United States. Soil Conservation Service. Shows land use.; "June 1979." 66 x 51 centimeters. The Service (Washington, D.C.?).
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1980. United States. Soil Conservation Service. Shows land use.; "Interpretations derived from soil map constructed 1979 by Cartographic Division, Soil Conservation Service, USDA, of the State of... The Service (Washington, D.C.?).