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Subject
- World maps10
- Ethnology6
- Ethnic groups5
- Land use5
- Population density5
- Gas fields4
- Oil fields4
- Physical geography4
- Petroleum pipelines3
- Time3
- Contiguous zones (Law of the sea)2
- Gas pipelines2
- Land use, Rural2
- Natural resources2
- Ocean2
- Oil and gas leases2
- Partition, Territorial2
- Petroleum2
- Petroleum refineries2
- Petroleum shipping terminals2