2013. United States. Department of Agriculture. This data set is a digital soil survey and generally is the most detailed level of soil geographic data developed by the National Cooperative Soil ... U.S. Department of Agriculture, Natural Resources Conservation Service.
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2006. United States. Department of Agriculture. This data set consists of general soil association units for the state of Arizona. It was develped by the National Cooperative Soil Survey and supe... U.S. Department of Agriculture, Natural Resources Conservation Service.