Geology 74 South Carolina 42 Groundwater 37 Water quality 35 Stream measurements 29 Aquifers 24 Geology, Stratigraphic 24 Groundwater Pollution 21 South Carolina History 21 Mines and mineral resources 20 South Carolina Politics and government 19 Groundwater flow 15 Water-supply 15 African Americans 14 Water Pollution 14 Hydrogeology 13 National parks and reserves 13 Sediment transport 13 Earthquakes 12 Environmental monitoring 12 Geochemical prospecting 12 Historic sites 12 Borings 11 Floods 11 Hurricane Hugo, 1989 11 Post office buildings 11 Fort Sumter and Fort Moultrie National Historical Park (S.C.) 10 Saltwater encroachment 10 Streamflow 10 Floodplains 9 Wildlife refuges 9 Charleston (S.C.) History 8 Flood forecasting 8 Geochemistry 8 Geology, Structural 8 Groundwater Quality 8 Hydrology 8 North Carolina 8 Congaree National Park (S.C.) 7 Floridan Aquifer 7 Hazardous waste sites 7 Historic sites Law and legislation 7 Paleontology 7 Reconstruction (U.S. history, 1865-1877) 7 South Carolina Population 7 United States 7 Catawba Indians Land tenure 6 Emergency management 6 Gold ores 6 Hurricanes 6 Kings Mountain National Military Park (S.C.) 6 Nutrient pollution of water 6 Sediments (Geology) 6 Seismic prospecting 6 African Americans History 5 Auditing 5 Barrier islands Law and legislation 5 Caregivers 5 Catawba Indians Claims 5 Charles Pinckney National Historic Site (Mount Pleasant, S.C.) 5 Courthouses 5 Evacuation of civilians 5 Excavations (Archaeology) 5 Forest management 5 Francis Marion National Forest (S.C.) 5 Hurricane protection 5 Indians of North America Claims 5 Indians of North America Land tenure 5 Lake sediments 5 Land titles Registration and transfer 5 Monazite 5 Outdoor recreation 5 Radioactive prospecting 5 South Carolina Altitudes 5 Sumter National Forest (S.C.) 5 Water quality management 5 Water table 5 Charleston Earthquake, S.C., 1886 4 Disaster relief 4 Drill cores 4 Emergency communication systems 4 Flood control 4 Forest surveys 4 Forests and forestry 4 Geophysical well logging 4 Heavy minerals 4 Heavy minerals Analysis 4 Hydraulics 4 Hydrocarbons Biodegradation 4 Jet planes Fuel Environmental aspects 4 Menominee County (Wis.) Population 4 Menominee Indian Reservation (Wis.) Population 4 Military parks 4 North Carolina History 4 Nuclear power plants Licenses 4 Ore deposits 4 Paleontology, Stratigraphic 4 Placer deposits 4 Sacramento Metropolitan Area (Calif.) Population 4 Santee National Wildlife Refuge (S.C.) 4