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Subject
- Oil and gas exploration[remove]147
- Legislative amendments92
- Oil and gas leases71
- Petroleum industry and trade40
- Petroleum37
- Mineral Leasing Act32
- Public lands26
- Natural gas23
- United States. Department of the Interior21
- Mineral lands20
- Petroleum reserves19
- Mining leases18
- Continental shelf16
- Mines and mineral resources16
- Congressional investigations13
- Licenses13
- Mining claims13
- Mineral resources in submerged lands12
- Mineral rights10
- Federal-state relations9