Koolen, A. J. 1944- Agricultural soil mechanics / A. J. Koolen, H. Kuipers - Berlin : Springer-Verlag, 1983 - xi, 241 p. : ill. ; 25 cm - Advanced series in agricultural sciences v.13 . Bibliography : p. 228 -235 ISBN: 3540122575 LCCN: 83-004646 Subjects--Topical Terms: Soil mechanicsTillage