Illinois State Geological SurveyPrairie Research InstituteUniversity of Illinois Urbana-ChampaignWebsite for finding and accessing open data provided by Illinois State Geological Surveyhttps://clearinghouse.isgs.illinois.eduengIllinois State Geological SurveyPublicState government recordsIllinois Geospatial Data ClearinghouseWebsitesIllinoisContinually updated resource