333.7 Land, recreational and wilderness areas, energy
333.79 Energy
333.790973 Energy policy--United States 333.7911 Energy supply 333.79137 Abuse and wastage 333.7915 Energy development 333.7916 Energy conservation 333.792 Primary forms of energy 333.793 Secondary forms of energy 333.794 Renewable energy resources 333.796 Energy for specific uses
Dewey Decimal Classification
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