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Subject
- Land use, Rural24
- Geology22
- Mines and mineral resources12
- Land use11
- Aquifers5
- Geology, Structural5
- Hydrogeology5
- Water table4
- Biotic communities3
- Ecology3
- Economic conditions3
- International status3
- Natural gas3
- Outdoor recreation3
- Petroleum3
- Discoveries in geography2
- Discovery and exploration2
- Ethnic groups2
- Ethnology2
- Explorers2
