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Subject
- Geology86
- Coal57
- Groundwater38
- Magnetic anomalies17
- Aquifers12
- Indians of North America12
- Roads12
- Indian reservations11
- World maps10
- Geochemical prospecting9
- Geology, Structural9
- Mines and mineral resources9
- Navigation9
- Maps8
- Nautical charts8
- Geology, Stratigraphic7
- Sediments (Geology)7
- Hydrology4
- Land use4
- Petroleum4
