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activities addition Administration agencies applications aquifer assessment Assistant Authority basin Board Bureau cartographic changes Chief City City of w coal collected Commission completed compounds concentrations conducted Connecticut Conservation contamination continued Control cooperative County data base Department deposits designed distribution District District w Division Earth earthquakes effects effort energy Environmental facilities fault Federal feet field Figure flow geographic ground ground-water indicate information systems Lake land located major Management maps material measured ment miles million mineral resources mining models National Center natural needs Office Operations organic Park percent Planning potential present processes production projects Public Regional River rocks samples scale Science scientific scientists sediments Service sources South standards Stop studies surface techniques tion Transportation types U.S. Geological Survey United University USGS Volcano Water Resources zone