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Subject
- Land use, Rural24
- Geology23
- Land use15
- Mines and mineral resources13
- Roads9
- Geology, Structural6
- Aquifers5
- Hydrogeology5
- Water table4
- World maps4
- Biotic communities3
- Ecology3
- Economic conditions3
- International status3
- Natural gas3
- Outdoor recreation3
- Petroleum3
- Administrative and political divisions2
- Discoveries in geography2
- Discovery and exploration2
