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activities addition Administration agencies Alaska analysis aquifer areas assessment Assistant associated basins Bldg Board Bureau California cartographic changes Chief City City of w coal collected Commission completed concentrations Conservation contaminants continued Control Cooperative County data base Department deposits distribution District District w Division earthquake energy Environmental eruption Federal feet Figure fiscal year 1984 flow geographic glacier ground water ground-water hazards hydrologic important increase International irrigation Lake land located major Management maps measured miles million mineral resources models National Center Natural needs North Office Operations organic Planning potential prepared present problems production Public quadrangle range record Regional reports River rocks scientific scientists selected Service showing sources stations STOP studies supplies surface techniques tion Transportation trends types U.S. Geological Survey understanding United waste Water Resources zone