United States 110
Geology 50
Mines and mineral resources 48
Housing 35
Computer files 29
United States Population 27
Older people 26
United States Economic conditions 20
Geographic information systems 19
Ore deposits 17
Digital mapping 16
Educational surveys 16
Groundwater 14
Health behavior 14
Information services 14
Water quality 14
Industrial statistics 13
Public health 13
Agriculture 12
Demographic surveys 12
Geochemistry 12
Income 12
Land grants 12
Database management 11
Geomagnetism 11
Health surveys 11
Land titles Registration and transfer 11
Stream measurements 11
Education 10
Election districts 10
Geodatabases 10
Government publications 10
Hydrology 10
Petroleum industry and trade 10
Transportation 10
Census districts 9
Foreign worker certification 9
Gas industry 9
Health risk assessment 9
Hydrogeology 9
Seismic prospecting 9
Zip codes 9
Air Pollution 8
Geology, Stratigraphic 8
National income Accounting 8
Natural gas Prospecting 8
Occupations 8
Petroleum Prospecting 8
Streets 8
Water-supply 8
Childbirth 7
Earth sciences 7
Gross national product 7
Land use 7
Public schools 7
Water Pollution 7
Auditing 6
Business 6
Criminal justice, Administration of 6
Databases 6
Education, Higher 6
Emergency management 6
Exports 6
Geology, Structural 6
High school graduates 6
Information storage and retrieval systems 6
Information storage and retrieval systems Geology 6
Law enforcement 6
Pollution 6
Science 6
United States Climate 6
Water quality management 6
Agriculture States 5
Ambulatory medical care Utilization 5
Aquifers 5
Climatic changes 5
College attendance Longitudinal studies 5
Earthquakes 5
Education, Secondary 5
Geological mapping 5
Geophysics 5
Government information 5
Imports 5
Infants Mortality 5
Information resources management 5
Information storage and retrieval systems Education 5
Information storage and retrieval systems Government publications 5
Juvenile delinquents 5
Management information systems 5
National parks and reserves 5
Natural gas reserves 5
Paleontology 5
Petroleum reserves 5
Postsecondary education Longitudinal studies 5
Registers of births, etc 5
Solar radiation 5
South Carolina Population 5
Students Longitudinal studies 5
Atmospheric temperature 4
Cartography 4