Syltie, Paul W. How soils work : a study into the God-plane mutualism of soils and crops / by Paul W. Syltie. - Fairfax, VA : Xulon Press, c2002. - xxi, 165 p. : ill., maps ; 24 cm. Includes bibliographical references (p. 139-156) and index. ISBN: 1591600952 Subjects--Topical Terms: Crops and soils. LC Class. No.: ORG S596.7 / S95 2002