"American Society of Agronomy. Division S-3." . . "Keeney, D. R." . . "Power, J. F." . . "Ciencias agrarias." . . "Ecologia agrícola Congressos." . . "Agriculture durable Congrès." . . . . . "Organic farming : current technology and its role in a sustainable agriculture : proceedings of a symposium" . . . . . . . . . "Organic farming: Current technology and its role in a sustainable agriculture : proceedings of a symposium"@en . . . . "Overview; Nutrient cycling and tillage; Reducing pesticide inputs; Energy, economics, and public policy." . . . . . . . . . . "Organic farming current technology and its role in a sustainable agriculture : proceedings of a symposium"@en . . . "Conference papers and proceedings" . "Conference papers and proceedings"@en . . . . "Organic farming : current technology and its role in a sustainable agriculture" . "Organic farming : current technology and its role in a sustainable agriculture"@en . "Organic farming current technology and its role in a sustainable agriculture" . . . . "Organic farming : current technology and its role in a sustainable agriculture : proceedings of a aymposium" . . . . . . . . . . . . . "Sustainable agriculture Congresses." . . "WRIGHT, M. J. (Ed.)." . . "Agriculture biologique Congrès." . . "Organic farming Congresses." . . . .