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activities Administration agencies agricultural aquifer areas Assessment atmosphere Award Bureau Center City City of w coal Colorado comet Commission concentrations contaminant cooperation in earth County Water data sets database debris flows discharge distribution Division DSDL earth science environment Environmental Federal flood floodplain geographic information systems Geological Survey USGS GeoMedia geospatial data global ground-water Guayana Shield hazards High Plains hydrologic impact Internet Irrigation kilometers Lake land levees locations Management District maps ment methane Mississippi River monitoring Mount Rainier Municipal natural gas nitrate Northridge earthquake NSDI º º pesticides petroleum Planning region Reston River Basin SAST Scientific and technical scientists sediment seismic Service South Platte River spatial data studies technical cooperation Telephone tion Transportation U.S. Geological Survey University users USGS Valley videoconferencing Volunteer Water Conservation District Water District Water Resources