The Gap between rich and poor nations : proceedings of a conference held by the International Economic Association at Bled, Yugoslavia; edited by Gustav Ranis. Ranis, Gustav, ed. International Economic Association. Economic history 1945-1971 Congresses. Economic assistance Developing countries Congresses. HC59 .G32 330.9 RAG Includes bibliographical references and index. London : St. Martin's P., 1972. 1972. 1972 Text xxii, 439 p. : eng Developing countries Economic conditions Congresses. Developing countries