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Subject
- Petroleum industry and trade390
- Petroleum315
- Environmental aspects159
- Petroleum products128
- Petroleum reserves119
- Law and legislation93
- Petroleum law and legislation85
- Natural gas81
- Oil and gas leases79
- Prices78
- Offshore oil industry66
- Petroleum in submerged lands62
- Geology59
- Energy policy51
- Offshore gas industry48
- Taxation47
- Petroleum refineries38
- Pollution37
- Gas industry35
- Natural gas reserves34