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Subject
- Geology131
- Navigation70
- Groundwater30
- Sediments (Geology)27
- Aquifers19
- Maps17
- Mines and mineral resources17
- Nautical charts16
- Geology, Stratigraphic15
- Harbors14
- Roads12
- Administrative and political divisions9
- Geochemical prospecting9
- World maps9
- Coal8
- Gravity anomalies8
- Indian reservations8
- Deserts7
- Geology, Structural7
- Earthquakes6
