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Fuel
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- environmental aspects (7)
- purification (4)
- recycling (waste, etc.) (3)
- sustainable engineering (3)
- waste products as fuel (3)
- water (3)
- coal (2)
- coal-fired power plants (2)
- environmental chemistry (2)
- government policy (2)
- health aspects (2)
- refuse as fuel (2)
- sewage (2)
- accidents (1)
- addresses, essays, lectures (1)
- addresses, essays, lectures (1)
- adverse effects (1)
- aeronautics, commercial (1)
- aircraft exhaust emissions (1)
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