IB 20 Timeline

Events

April 4, 1968
July 20, 1969
August 15, 1969 - August 18, 1969
June 17, 1972
April 30, 1975
April 24, 1981
January 1, 1983
August 20, 1985 - March 4, 1987
June 4, 1989
June 13, 1990 - November, 1991