editors, John Ragland and Rattan Lal ; organizing committee, John Ragland (1990), Uzo Mokwunye (1991) ; editorial committee, Kenneth Cassman ... [et al.] ; editor[s] in chief, Gary A. Peterson, P.S. Baenziger, Robert J. Luxmoore
American Society of Agronomy : Crop Science Society of America : Soil Science Society of America
1993
ASA special publication
no. 56
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