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General ecology and biosociology --- Relation between energy and economics --- Power resources --- Force and energy --- Ressources énergétiques --- Force et énergie --- 620.91 --- -Force and energy --- -Conservation of energy --- Correlation of forces --- Energy --- Physics --- Dynamics --- Energy resources --- Power supply --- Natural resources --- Energy harvesting --- Energy industries --- Energy resources in general. Natural sources of energy --- Addresses, essays, lectures --- Force and energy. --- Power resources. --- Agrotechnology and Food Sciences. Engineering --- Addresses, essays, lectures. --- -Energy resources in general. Natural sources of energy --- Energy. --- 620.91 Energy resources in general. Natural sources of energy --- -620.91 Energy resources in general. Natural sources of energy --- Conservation of energy --- Ressources énergétiques --- Force et énergie