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Subject
- Geology103
- Groundwater52
- Magnetic anomalies23
- Mines and mineral resources20
- Maps15
- Geomagnetism11
- Coastal ecology9
- Volcanic ash, tuff, etc9
- World maps9
- Administrative and political divisions8
- Water chemistry8
- Aquifers7
- Geology, Stratigraphic7
- Granite7
- Land use7
- Basalt6
- Continental shelf6
- Earthquakes6
- Geology, Structural6
- Navigation6
