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2003. California. Department of Water Resources. The polygon shapefile contains the boundaries of 515 groundwater basins and subbasins as defined by the California Department of Water Resources (B... California. Department of Water Resources.
2003. Santa Clara Valley Water District (Calif.). This polygon shapefile depicts boundaries for Depth to First Groundwater in feet for the County of Santa Clara, California groundwater subbasins. T... Santa Clara Valley Water District (Calif.).
2003. Geological Survey (U.S.). Water Resources Division. Wisconsin District. This polygon shapefile contains the shallowest principal aquifers of the conterminous United States, Hawaii, Puerto Rico, and the U.S. Virgin Islan... Geological Survey (U.S.).