Groundwater 43 Geology 39 Aquifers 37 Alabama 34 Water quality 29 Groundwater Pollution 27 Hydrogeology 25 Water-supply 22 Geology, Stratigraphic 19 Military education 19 Stream measurements 19 Iron ores 18 Outdoor recreation 17 Floods 16 Wildlife refuges 15 African Americans Civil rights History 13 Talladega National Forest (Ala.) 13 African Americans 12 Alabama Politics and government 12 Automobile driving 12 Forest roads 12 Motor vehicles Recreational use 12 Mines and mineral resources 11 Natural gas pipelines Environmental aspects 11 Alabama History 9 History 9 Hydrology 9 Post office buildings 9 Bauxite 8 Civil rights movements History 8 Civil rights workers 8 Flood control 8 Streamflow 8 Trails 8 Water Pollution 8 Coal mines and mining 7 Flood forecasting 7 Gold mines and mining 7 Hunting 7 Mississippi 7 National parks and reserves 7 Wheeler National Wildlife Refuge (Ala.) 7 William B. Bankhead National Forest (Ala.) 7 Auditing 6 Environmental monitoring 6 Groundwater Quality 6 Iron mines and mining 6 Segregation in transportation History 6 Barrier islands 5 Civil rights 5 Coal 5 Conecuh National Forest (Ala.) 5 Environmental impact statements 5 Forests and forestry 5 Grants-in-aid Auditing 5 Horseshoe Bend National Military Park (Ala.) 5 Hydroelectric power plants Licenses 5 Interstate agreements 5 Little River Canyon National Preserve (Ala.) 5 Montgomery (Ala.) 5 Paleontology 5 Reconstruction (U.S. history, 1865-1877) 5 Rivers 5 Tennessee 5 Tuskegee National Forest (Ala.) 5 Water resources development 5 African American women 4 African Americans Civil rights 4 Alabama Altitudes 4 Alabama Rural conditions 4 Bon Secour National Wildlife Refuge (Ala.) 4 Coal washing 4 Coast changes 4 Endangered species 4 Eufaula National Wildlife Refuge (Ala. and Ga.) 4 Evaluation 4 Foraminifera, Fossil 4 Forest management 4 Forest reserves 4 Governors 4 Land use Planning 4 Montgomery (Ala.) Race relations 4 Ore-dressing 4 Pesticides Environmental aspects 4 Rules and practice 4 Sturgeons 4 Tennessee-Tombigbee Waterway (Ala. and Miss.) 4 Water rights 4 Water table 4 Wildlife refuges Law and legislation 4 African American civil rights workers 3 Alabama Description and travel 3 Alabama Geology 3 Alabama Social conditions 3 Bird watching 3 Birds 3 Cahaba River National Wildlife Refuge (Ala.) 3 Childhood and youth 3 Choctaw Indians Legal status, laws, etc 3 Choctaw National Wildlife Refuge (Ala.) 3