2013. United States. Geological Survey. This dataset is provided as part of the USGS National Hydrology Dataset and depicts the point locations for major dams in all fifty states and Puer... United States Geological Survey.
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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.
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