Subject
United States
89
Housing
32
Computer files
27
Mines and mineral resources
25
Older people
25
Geology
22
United States Population
22
United States Economic conditions
18
Health behavior
12
Educational surveys
11
Income
11
Land grants
11
Geochemistry
10
Industrial statistics
10
Land titles Registration and transfer
10
Agriculture
9
Census districts
9
Demographic surveys
9
Election districts
9
Health surveys
9
Health risk assessment
8
Streets
8
Zip codes
8
Childbirth
7
Public health
7
Transportation
7
Digital mapping
6
Geographic information systems
6
Geomagnetism
6
High school graduates
6
National income Accounting
6
Occupations
6
Seismic prospecting
6
College attendance Longitudinal studies
5
Foreign worker certification
5
Gross national product
5
Hydrology
5
Infants Mortality
5
Natural gas reserves
5
Petroleum reserves
5
Postsecondary education Longitudinal studies
5
South Carolina Population
5
Students Longitudinal studies
5
Water quality
5
Ambulatory medical care Utilization
4
Climatic changes
4
Education
4
Fertility, Human
4
Geology, Stratigraphic
4
Geology, Structural
4
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