The Widening gap: development in the 1970's : a report on the Columbia Conference on International Economic Development, Williamsburg, Virginia, and New York, February 15-21, 1970 / Edited by Barbara Ward ; J. D. Runnalls, and Lenore D'Anjou. Ward, Barbara ed. Runnalls, J. D. ed. D'Anjou, Lenore ed. Economic development Congresses. 338.91 WID Includes bibliographical references. New York : Columbia University Press, 1971. 1971. 1971 Text xi, 372 p. : eng