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