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Subject
- Geology128
- Navigation66
- Groundwater30
- Sediments (Geology)27
- Aquifers19
- Mines and mineral resources17
- Maps16
- Geology, Stratigraphic15
- Nautical charts15
- Harbors13
- Geochemical prospecting9
- Coal8
- Indian reservations8
- World maps8
- Deserts7
- Geology, Structural7
- Gravity anomalies7
- Earthquakes6
- Geomagnetism6
- Formations (Geology)5
