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Subject
- Geology120
- Mines and mineral resources36
- Groundwater26
- Roads25
- Indians of North America21
- Indian reservations20
- Sediments (Geology)20
- Maps16
- Geochemical prospecting13
- Geology, Stratigraphic13
- Geology, Structural13
- Geomagnetism12
- Aquifers11
- Coal9
- Gravity anomalies9
- Land use9
- World maps8
- Administrative and political divisions6
- Deserts6
- Earthquakes6
