• 7 Videos, Slides, Films

• 6 Energy development
• 6 Technology and civilization
• 5 Environmental aspects
• 4 Power resources
• 2 Petroleum industry and trade
• 1 City planning
• 1 Food industry and trade
• 1 History
• 1 Military aspects
• 1 Petroleum
• 1 Political aspects
• 1 Transportation
• 1 Urban ecology (Sociology)
• 1 War
• 1 Water resources development
• 1 Water-power
• 1 Wealth

• 6 Alpheus Media (Firm)
• 6 Hames, Beth
• 6 Hames, Mat
• 6 Howard, Rosa
• 6 Public Broadcasting Service (U.S.)
• 1 BBC Scotland
• 1 BBC Worldwide Learning
• 1 Healy, Declan

• 7 English

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