20160721 12193100 1.0 FGDC CSDGM Metadata TRUE Map depicting Illinois public water supply (PWS) wells that use Cambrain-Ordovician sandstone aqufers aquifers geology illinois groundwater Map depicting Illinois public water supply (PWS) wells that use Cambrain-Ordovician sandstone aqufers ISGS, ISWS Cambrian-Ordovician Sandstone Aquifer System 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