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Subject
- Pipelines10
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- Natural gas7
- Petroleum industry and trade6
- Gas fields5
- Oil fields4
- Maps3
- Petroleum3
- Water-power3
- World maps3
- Coal2
- Nuclear power plants2
- China1
- Electric power distribution1
- Energy consumption1
- Petroleum products1
- Petroleum refineries1
- Petroleum shipping terminals1
- Petroluem1
