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Subject
- Geology113
- Groundwater37
- Coal32
- Coastal ecology29
- Mines and mineral resources12
- Land use11
- Limonite8
- Sediments (Geology)8
- Geomagnetism7
- Public lands7
- Continental shelf6
- Water resources development6
- Cartes5
- Geology, Stratigraphic5
- Geology, Structural5
- Maps5
- Petroleum5
- Geothermal resources4
- Gravity anomalies4
- Natural gas4
