Geology 264
Kentucky 67
Groundwater 49
Geology, Stratigraphic 45
Water quality 37
Coal 33
Water-supply 26
Paleontology 25
Mines and mineral resources 19
Groundwater flow 18
Hydrogeology 18
Hydrology 18
Fluorspar 17
Stream measurements 16
Kentucky History 15
National parks and reserves 14
Abraham Lincoln Birthplace National Historical Park (Ky.) 13
Geology, Structural 12
Aquifers 11
Historic sites 11
Streamflow 11
Water Pollution 11
Coal mines and mining 10
Military education 10
Daniel Boone National Forest (Ky.) 9
Groundwater Pollution 9
Coal Geology 8
Water Composition 8
Frontier and pioneer life 7
Groundwater Quality 7
Hydroelectric power plants Licenses 7
Outdoor recreation 7
Pesticides Environmental aspects 7
Petrology 7
Strip mining Environmental aspects 7
Water quality Measurement 7
Water quality management 7
Buildings 6
Coal Sampling 6
Coal mines and mining Environmental aspects 6
Freshwater biology 6
Geochemical prospecting 6
Hydroelectric power plants Law and legislation 6
Limestone 6
Paleobotany 6
Trails 6
Wages 6
Birthplace 5
Borings 5
Coal preparation 5
Cumberland Gap National Historical Park 5
Earthquakes 5
Environmental monitoring 5
Gaseous diffusion plants Environmental aspects 5
Groundwater tracers 5
Kentucky Description and travel 5
Management 5
Nuclear industry Employees Health and hygiene 5
Nutrient pollution of water 5
Officials and employees 5
Oil fields 5
Petroleum 5
Petroleum Geology 5
Reelfoot National Wildlife Refuge (Tenn. and Ky.) 5
Suspended sediments 5
Wildlife refuges 5
Coal Carbonization 4
Coal reserves 4
Fast food restaurants 4
Faults (Geology) 4
Flood forecasting 4
Floods 4
Folk music 4
Forests and forestry 4
Geomagnetism 4
Grants-in-aid Auditing 4
Homes and haunts 4
Indiana 4
Industrial water supply 4
Kentucky Altitudes 4
Mammoth Cave National Park (Ky.) 4
Music Instruction and study 4
Music Performance 4
Musical form 4
Occupational diseases 4
Oil-shales 4
Paleoecology 4
Palynology 4
Radioactive pollution 4
River sediments 4
Style, Musical 4
Tennessee 4
Wages Food industry and trade 4
Water consumption 4
Water table 4
Water use 4
Academic achievement 3
Authors, American 3
Big South Fork National River and Recreation Area (Tenn. and Ky.) 3
Bridges Law and legislation 3