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2013. California. Department of Water Resources. This polygon shapefile represents statewide groundwater management plan boundaries within the state of California. These boundaries were originally... California. Department of Water Resources.
2012 and 2013. Wyoming Geographic Information Sciences Center. This polygon shapefile contains the 5th level, 10 digit hydrologic unit code (HUC) watershed boundaries in California. This layer consists of geore... Wyoming Geographic Information Sciences Center.