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621.47 <063> --- Energy conservation --- -Energy storage --- -Storage of energy --- Force and energy --- Power (Mechanics) --- Flywheels --- Pulsed power systems --- Conservation of energy resources --- Conservation of power resources --- Rational use of energy --- RUE (Rational use of energy) --- Conservation of natural resources --- Power resources --- Energy consumption --- Energy policy --- Recycling (Waste, etc.) --- Engines using radiant energy--Congressen --- Congresses --- -Engines using radiant energy--Congressen --- 621.47 <063> Engines using radiant energy--Congressen --- Energy storage
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Energy conservation --- Energy consumption --- Energy policy --- Environmental protection --- Conservation of energy resources --- Conservation of power resources --- Rational use of energy --- RUE (Rational use of energy) --- Conservation of natural resources --- Power resources --- Recycling (Waste, etc.) --- Environmental quality management --- Protection of environment --- Environmental sciences --- Applied ecology --- Environmental engineering --- Environmental policy --- Environmental quality --- Society and energy policy --- Consumption of energy --- Energy efficiency --- Fuel consumption --- Fuel efficiency --- History --- Social aspects --- Relation between energy and economics --- World history
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620.91 --- Energy conservation --- -Energy policy --- -Energy and state --- Power resources --- State and energy --- Industrial policy --- Conservation of energy resources --- Conservation of power resources --- Rational use of energy --- RUE (Rational use of energy) --- Conservation of natural resources --- Energy consumption --- Energy policy --- Recycling (Waste, etc.) --- Energy resources in general. Natural sources of energy --- Government policy --- -Energy resources in general. Natural sources of energy --- 620.91 Energy resources in general. Natural sources of energy --- -Conservation of energy resources --- Energy and state --- Climatisation --- Contrôle --- Contrôle --- Experimentation
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