IB 20th

Events

March 26, 1953
May 9, 1960
October 16, 1962 - October 28, 1962
November 22, 1963
July 2, 1964
April 4, 1968
July 20, 1969 - July 24, 1969
1971 - 1973
June 17, 1972
November 4, 1979 - January 20, 1981