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- Oil and gas leases46
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- Environmental aspects23
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- Law and legislation20
- Offshore oil and gas leases20
- Energy development19
- Analysis17
- Government policy17
- Offshore oil well drilling17
- United States17
- Management16
- Methodology15
- Economic aspects14
- Offshore gas well drilling14
- analysis14
- Petroleum industry and trade13
- Odorants11
- Research11
- Continental shelf10