Sustainable agricultural systems
edited by Clive A. Edwards ... [et al.].
Ankeny, Iowa : Soil and Water Conservation Society, ©1990.
696 págs. : ilustraciones ; 24 cm.
ISBN: 093573421X
"Proceedings of the International Conference on Sustainable Agricultural Systems that was held at Ohio State University, Columbus, Ohio, in September 1988 ... [under the] sponsorship of USAID ... [et al.]"—P. xiv.