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Subject
- Geology20
- Administrative and political divisions14
- Roads13
- Population8
- Petroleum7
- Outdoor recreation6
- Continental shelf4
- Land use4
- Natural gas4
- Oil and gas leases4
- Submarine topography4
- Census districts3
- Geology, Structural3
- Land use, Rural3
- Maps3
- Metropolitan areas3
- Mines and mineral resources3
- Public lands3
- World maps3
- Aquatic habitats2
