"Agriculture durable." . . "Økologi" . . "Agricultural systems." . . . . . . . . "Conference proceedings"@en . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . "An Overiew of sustainable agriculture; Components of sustainable agricultural systems; The importance of integration in sustainable farming systems; Sustainable agricultural systems in the tropics; Policy development for the low-input sustainable agriculture program; Improved ecological impacts of sustainable agriculture." . . . . . . . "Sustainable agricultural systems"@en . "Sustainable agricultural systems" . . . . . . . . . . . . . . . . . . . . . . . . . . . "International Conference on Sustainable Agricultural Systems (Ohio State University) (1988)." . . . "Systèmes agricoles." . . "Økologisk landbrug" . . "Sistemas agrícolas." . . . . "Cropping systems" . . "HOUSE, G. (Ed.)." . . "Duurzame landbouw." . . "Sistemes d'agricultura." . . "Landwirtschaft" . . "Landwirtschaft." . "Madden, P." . . "Miller, R. H." . . "Farming systems" . . "Sistemes agrícoles." . . "Agrarökologie." . . "Systèmes agraires." . . "Ecologia agrícola." . . "Dyrkningssystemer" . . "Agricultura sostenible." . . "Assistance agricole." . . "Estats Units d'Amèrica. Agency for International Development." . . "Landbrug" . . "Landwirtschaftliche Bodennutzung." . . "Landwirtschaftliche Bodennutzung" . "Ecology" . . "Landbrugssystemer" . . "Plantedyrkning" . . "Lal, R." . . "Umweltverträglichkeit." . . "Agrarsystem." . . "Agronomy" . . "Organic farming" . . "Bæredygtigt landbrug" . . "Agriculture" . . "Sustainable agriculture." . . "Sustainable agriculture" . "Enginyeria agronòmica." . . "International Conference on Sustainable Agricultural Systems (1988. Ohio State University)" . . . "International Conference on Sustainable Agricultural Systems (1988 : Ohio State University)" .