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activities Administration Alaska aquifer aquifer system areas assessment Atlantic Coastal Plain Basin boundary Bureau California cartographic Central chemical chemical elements Chief City Commission contain cooperative Coordination County cover mapping dams data base Denver Department of Public deposits Division earth science earthquake Energy Environmental feet fiscal year 1985 Flood Franciscan assemblage geographic geologic mapping Geologist geophysical ground water ground-water hydrologic image maps Information Systems investigations irrigation Lake land cover Landsat landslide major manganese mapping projects miles Mineral Resources mitigation National Center National Mapping ocean Office oil and gas photographs Planning potential quadrangle Raton Basin remote sensing River rocks San Joaquin Valley sand blows scientists sediment sedimentary seismic seismometers selenium Service slope soil sources Stop studies surface tion topographic Transportation U.S. Geological Survey United USGS Valley volcano Water Conservation District Water District water quality Water Resources water supply water-quality Wildlife zone