The Blue helmets : a review of United Nations peace-keeping / United Nations. United Nations. United Nations. Department of Public Information. United Nations Armed Forces. JX1981.P7 B62 1990 341.23 UNB "United Nations publication sales no. E.90.I.18"--T.p. verso. "DPI/1065--40500--August 1990--21M"--T.p. verso. New York : United Nations, Dept. of Public Information, c1990. c1990. 1990 Text xx, 449 p., [18] p. of plates : eng