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Subject
- Petroleum industry and trade98
- Petroleum7
- History6
- Environmental aspects5
- Political aspects5
- Vocational guidance5
- Energy policy4
- Gas industry4
- Military aspects4
- Petroleum products4
- Natural gas3
- Oil fields3
- Petroleum engineering3
- Social aspects3
- Anglo-Iranian Oil Company2
- Climatic changes2
- Continental shelf2
- Economic policy2
- Eminent domain2
- Finance2