Robe and Plough: Monasticism and Economic Interest in Early Medieval Sri Lanka. By R. A. L. H. Gunawardana. Tucson: University of Arizona Press for the Association for Asian Studies (Association for Asian Studies Monographs and Papers, 35), 1979. xii, 377 pp. Bibliography, Chronological Chart, Index. $9.50 (cloth); $5.95 (paper)