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Subject
- Geology212
- Land use, Rural133
- Mines and mineral resources94
- Geology, Stratigraphic23
- MT21
- Real property19
- Aquifers17
- Coal17
- Geomagnetism13
- Geology, Structural10
- Groundwater10
- Land use10
- Gravity anomalies9
- Railroads9
- Roads9
- Water resources management9
- Outdoor recreation8
- Indian reservations7
- Mining claims7
- Fire insurance5
