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