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