Planning development / Keith B. Griffin and John L. Enos. Griffin, Keith B. Enos, John L. (John Lawrence), 1924-, joint author. Economic policy. Economic policy Mathematical models. HD82 .G678 338.9 GRP Includes index. Bibliography: p. 239-253. London : Addison-Wesley Pub. Co., 1970. 1970. 1970 Text xiii, 262 p. ; eng Addison-Wesley development economics series