Economic development of under-developed countries : questions relating to international trade and commodities : international trade as the primary instrument for economic development : Cameroun, Chad, Congo (Leopoldville), Guinea, Indonesia, Libya, Mali, Mauritania, Morocco, Nigeria, Senegal, Sierra Leone, Sudan, Togo, Tunisia, United Arab Republic : amendments to the draft resolution submitted by Argentina, Bolivia, Costa Rica and Uruguay (A/C.2/L.550/Rev.2)