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Petroleum industry and trade Environmental aspects 5 Social aspects 2 Social conditions 2 Suburbs 2 Actions and defenses 1 Automobiles 1 more ... Cities and towns 1 Economic conditions 1 Economic history 1 Environmental justice 1 Environmental protection 1 Fuel consumption 1 Government policy 1 Growth 1 Indians of North America 1 Oil spills 1 Petroleum 1 Petroleum law and legislation 1 Transportation 1 less ...

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