Predicting tillage effects on soil physical properties and processes - P.W. Unger; D.M. Van Doren, Jr. American Society of Agronomy (Madison American Society of Agronomy, 1982)
P.W. Unger; D.M. Van Doren, Jr. & American Society of Agronomy: Predicting tillage effects on soil physical properties and processes. Madison. American Society of Agronomy, 1982.--(631.43UNG)
ENGLISH