"EF, Europæiske Fællesskaber" . . "USA" . . "Agriculture." . . "Australia" . . "Évaluation énergétique Agriculture Modèles mathématiques." . . "Agricultural policies" . . "Energy sources" . . "Energieversorgung" . . "Energieversorgung." . "Landwirtschaft" . . "Landwirtschaft." . "Economics" . . . . "Økonomi" . . "Économies d'énergie Agriculture Modèles mathématiques." . . "Kongress." . . "Aufsatzsammlung." . . "Agricultura." . . "European Communities" . . "Australien" . . . . . . . . "Aufsatzsammlung" . . . . "Energy and agriculture" . "Energy and agriculture"@en . . . . . . . . . . . . . . . . . . . . . "Energy and Agriculture" . "Energy and Agriculture"@en . . . . . . . . . "Kongress" . . . "Electronic books"@en . . . "Introduction to the role of energy in agriculture; Economic impact of energy prices on agriculture; Energy analysis of the environmental role in agriculture; Genetic engineering to modify energy flow in agriculture; Energy source for agriculture; Energy in different agricultural systems; Agricultural labour: from energy source to sink; Energy use in the food-producing sector of the European economic community; Energy in Australian agricultural; Energy use and management in US agricultural." . . . . . . . . "Energiebedarf." . . "Energie." . . "Energikilder" . . "Landbrugspolitik" . . "Consommation d'énergie Agriculture Modèles mathématiques." . .