Ikerd, J.E.
Low-input sustainable agriculture farm decision support system Sustainable agriculture research and education in the field; a proceedings - Washington, D.C. (EUA) National Academy Press 1991 - p. 393-400
Low-input sustainable agriculture farm decision support system Sustainable agriculture research and education in the field; a proceedings - Washington, D.C. (EUA) National Academy Press 1991 - p. 393-400