Geology 45 Coal 31 Monongahela National Forest (W. Va.) 31 New River Gorge National Park and Preserve (W. Va.) 31 Water quality 30 West Virginia 28 Groundwater 25 Stream measurements 21 National parks and reserves 19 Outdoor recreation 17 Geology, Stratigraphic 16 Mines and mineral resources 16 Coal Geology 13 Coal mines and mining 13 Coal preparation 12 Hydrology 12 Water-supply 12 Coal mines and mining Environmental aspects 11 Floods 11 Streamflow 10 Trails 10 Wilderness areas 10 Canaan Valley National Wildlife Refuge (W. Va.) 9 Harpers Ferry National Historical Park 9 Spruce Knob-Seneca Rocks National Recreation Area (W. Va.) 9 Water Pollution 9 Conservation of natural resources 8 Groundwater Pollution 8 Groundwater Quality 8 Natural gas 8 Palynology 8 Rules and practice 8 Coal mine accidents 7 Courthouses 7 Fishing 7 Public buildings 7 Automobiles Recreational use 6 Gauley River National Recreation Area (W. Va.) 6 Hiking 6 Hydroelectric power plants Law and legislation 6 Hydroelectric power plants Licenses 6 Hydrogeology 6 Oil fields 6 Rivers Recreational use 6 Roads 6 Suspended sediments 6 West Virginia Altitudes 6 Wild and scenic rivers Law and legislation 6 Aquifers 5 Flood forecasting 5 Forests and forestry 5 Historic districts Law and legislation 5 Historic sites Law and legislation 5 Management 5 Methane 5 Paleobotany 5 Pennsylvania 5 Petroleum 5 Strip mining Environmental aspects 5 Virginia 5 Water quality management 5 Wheeling National Heritage Area (W. Va.) 5 Appropriations and expenditures 4 Bluestone National Scenic River (W. Va.) 4 Buildings 4 Coal Testing 4 Coal mines and mining Safety regulations 4 Drinking water Contamination 4 Forest surveys 4 Historic buildings Conservation and restoration 4 Industrial hygiene 4 Maryland 4 Military education 4 Mine explosions Prevention 4 Mine safety Government policy 4 Mine ventilation 4 National parks and reserves Law and legislation 4 Nature trails 4 Petroleum Geology 4 River channels 4 Runoff 4 Secondary recovery of oil 4 Veterans' hospitals 4 Water resources development Law and legislation 4 Watersheds 4 West Virginia Economic conditions 4 West Virginia Environmental conditions 4 Wildlife refuges 4 Camp sites, facilities, etc 3 Coal Sampling 3 Coal mines and mining Safety measures 3 Coalbed methane drainage 3 Dam failures 3 Drainage 3 Environmental auditing 3 Fernow Experimental Forest (W. Va.) 3 Geochemistry 3 Geology, Economic 3 Harpers Ferry National Historical Park Boundaries 3 Hazardous waste site remediation 3