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activities Administration Alaska analysis aquifer areas Assistant Bacillus cereus basins Bureau California cartographic data base Chiet City coal Columbia Glacier Commission contaminants Control coordination Denver Department of Public digital cartographic data digital data distribution Environmental eruption Federal agencies Federal Bldg feet fiscal year 1984 flow fluid inclusions geographic geographic information systems geohydrologic Geologist geophysical ground water ground-water hazards High Plains hydrologic ical image map Information Systems investigations irrigation Lake land Landsat lava located Loki Patera major Management million mineral deposits mineral resources models monitoring National Center National Mapping Division Office offshore Parkfield earthquake Planning potential production quadrangle radar Regional remote sensing Reston River rocks San Andreas fault scientific sediment seismic Service sources square miles STOP studies sulfur surface Survey scientists Survey's techniques tion topographic maps trends U.S. Geological Survey Volcano Water Conservation District Water District zone