Measures for the economic development of under-developed countries / report by a group of experts appointed by the Secretary-General of the United Nations. United Nations. Department of Economic Affairs. 330.9 UNM "United Nations publications. Sales no.: 1951.II.B.2." New York : United Nations-Department of Economic Affairs, 1951. 1951. 1951 Text ix, 108 p.; eng United Nations. United Nations. Document ; E/1986 [etc.] Developing countries.