Geology 105 Water quality 84 North Carolina 63 Groundwater 59 Mines and mineral resources 41 Aquifers 30 Stream measurements 30 Hydrogeology 29 Geology, Stratigraphic 28 Groundwater Quality 23 Cape Hatteras National Seashore (N.C.) 21 Hydrology 21 Streamflow 21 Indians of North America Legal status, laws, etc 20 National parks and reserves 20 Water-supply 20 Wildlife conservation 20 Historic buildings 19 Cape Lookout National Seashore (N.C.) 18 Floods 17 North Carolina History 17 Water Pollution 17 Courthouses 16 Federally recognized Indian tribes 16 Roads 16 Automobile driving Recreational use 15 Buildings 14 Nantahala National Forest (N.C.) 14 Paleontology 14 Groundwater Pollution 13 Outdoor recreation 13 Public buildings 13 Water quality Measurement 13 Wild horses Law and legislation 13 Wildlife refuges 13 Geomagnetism 12 Lumbee Indians Legal status, laws, etc 12 Pisgah National Forest (N.C.) 12 Groundwater flow 11 Historic sites 11 Barrier islands Law and legislation 10 Cape Lookout National Seashore (N.C.) Management 10 Coast changes 10 Flood forecasting 10 Geochemical prospecting 10 Geochemistry 10 History 10 Land titles Registration and transfer 10 Post office buildings 10 Shore protection Law and legislation 10 Water quality management 10 Environmental monitoring 9 Forests and forestry 9 Hydroelectric power plants Law and legislation 9 Off-road vehicles Law and legislation 9 Recreation areas Access 9 South Carolina 9 Trails 9 Blue Ridge Parkway (N.C. and Va.) 8 Coastal zone management Law and legislation 8 Historic buildings Conservation and restoration 8 Hydraulic measurements 8 Hydroelectric power plants Licenses 8 Lookout, Cape (N.C.) History 8 Lumbee Tribe of North Carolina 8 Management 8 Nutrient pollution of water 8 River sediments 8 Sediment transport 8 Veterans Medical care Law and legislation 8 Water table 8 Alligator River National Wildlife Refuge (N.C.) 7 Architecture, Domestic Conservation and restoration 7 Disaster relief 7 Heavy minerals 7 Ostracoda, Fossil 7 Veterans' hospitals 7 Virginia 7 Water resources development 7 Wildlife management 7 African Americans 6 Beach erosion 6 Black Creek Aquifer (S.C. and N.C.) 6 Copper ores 6 Croatan National Forest (N.C.) 6 Forest management 6 Geology, Structural 6 Hurricane Floyd, 1999 6 Indians of North America 6 Lighthouses 6 Limnology 6 Mica 6 Mineralogy 6 North Carolina Description and travel 6 Portsmouth (N.C.) History 6 Sedimentation and deposition 6 Sediments (Geology) 6 Suspended sediments 6 Coasts 5 Drinking water Contamination 5