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activities Administration Alaska aquifer areas basins Bureau California cartographic Chief City coal Commission concentrations contaminants cooperation Coordination County data base Denver Denver Federal Center Department of Public digital cartographic data earth science earthquake energy Environmental eruption Federal agencies Federal Bldg feet fiscal year 1986 flow Franciscan assemblage geographic information systems geologic mapping Geologist geophysical Gorda Ridge ground water ground-water hazards hydrologic image map Information Systems investigations irrigation land Landsat located major Management Menlo Park ment miles mineral resources National Center National Mapping Division Office Parkfield Parkfield earthquake percent Planning potential processes production Puerto Rico quadrangle radon Regional remote sensing resources assessment Reston River rocks scientific sediment seismic selenium Service soil sources Stop studies surface Survey's tion topographic Transportation U.S. Geological Survey United USGS Valley volcano Water Conservation District Water District water quality Water Resources Division water-quality zone