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Subject
- Geology116
- Groundwater38
- Coal32
- Coastal ecology29
- Mines and mineral resources14
- Land use11
- Limonite8
- Sediments (Geology)8
- Continental shelf7
- Geology, Structural7
- Geomagnetism7
- Phytogeography7
- Public lands7
- Administrative and political divisions6
- Maps6
- Population6
- Water resources development6
- Cartes5
- Geology, Stratigraphic5
- Petroleum5
