IB 20th centr histroy

Events

June 25, 1950 - July 27, 1953
Jul 26, 1953 - Jan 1, 1959
Apr 17, 1961 - Apr 19, 1961
March 16, 1968
May 26, 1972
April 30, 1975
15 April 1989 - 4 June 1989
20 December 1989 - 31 January 1990
April 6, 1992 - December 14, 1995
February 26, 1993