The least developed countries 1991 report / United Nations. Secretary-General (1961-1971 : Thant) United Nations. Department of Economic and Social Affairs. [from old catalog] Production JX1977 .A2 A/5533/rev. 1, etc. 338.9 UNL New York, United Nations, 1991. 1991. 1991 Text v. ; eng United Nations. Document A/5533/rev. 1, [etc.] [from old catalog]