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2013. California. Department of Water Resources. This polygon shapefile contains the boundaries of adjudicated groundwater basins in California. These data were developed using the best available ... California. Department of Water Resources.
2010, 2011, 2012, and 2013. U.S. Census Bureau. Geography Division and Environmental Systems Research Institute (Redlands, Calif.). This polygon shapefile represents the 2010 Census urban areas in the United States. An urban area comprises a densely settled core of census tracts... Environmental Systems Research Institute (Redlands, Calif.).