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- Petroleum industry and trade[remove]679
- Shell Oil Company679
- Chemical plants513
- Petroleum refineries512
- Environmental aspects13
- Strikes and lockouts10
- Rodeos9
- Pollution8
- Livestock7
- Offshore oil well drilling4
- Water pollution4
- Hunting trophies2
- Hurricanes2
- Pesticides2
- Public health2
- Safety measures2
- Service stations2
- Advertising1
- Airplanes1
- Barges1