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- Petroleum industry and trade[remove]1,705
- Shell Oil Company[remove]1,705
- Chemical plants1,539
- Petroleum refineries1,538
- Strikes and lockouts187
- Environmental aspects15
- Rodeos10
- Pollution8
- Livestock7
- Hurricanes6
- Christmas5
- Offshore oil well drilling5
- Water pollution4
- Public health3
- Corporation reports2
- Drug abuse2
- Hunting trophies2
- Pesticides2
- Safety measures2
- Service stations2