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Economics Lester R. Brown. Seeds of Change: The Green Revolution and Development in the 1970's. Pp. xv,205. New York: Praeger Publishers for the Overseas Development Council,1970. $6.95. Willard W. Cochrane. The World Food Problem: A Guardedly Optimistic View. Pp. xv,331. New York: Thomas Y. Crowell,1969. $7.95