• 1 2nd Congress, Geneva, 1931
  • | 2 5th Congress, Brussels, 1939
  • | 3 6th Congress, Paris, 1948
  • | 4 7th Congress, London, 1952
  • | 5 7th Congress, London, 1952
  • | 6 7th Congress, London, 1952
  • | 7 7th Congress, London, 1952
  • | 8 8th Congress, Oslo, 1957
  • | 9 8th Congress, Oslo, 1957
  • | 10 9th Congress, Cambridge, Mass, 1962
  • | 11 9th Congress, Cambridge, Mass, 1962
  • | 12 10th Congress, Bucharest, 1967
  • | 13 11th Congress, Bologna-Florence, 1972
  • | 14 11th Congress, Bologna-Florence, 1972
  • | 15 12th Congress, Vienna, 1977
  • | 16 13th Congress, Tokyo, 1982
  • | 17 14th Congress, Berlin, 1987
  • | 18 14th Congress, Berlin, 1987
  • | 19 15th Congress, Quebec, 1992
  • | 20 16st Congress, Paris, 1997
  • | 21 17st Congress, Prague, 2003
  • | 22 18st Congress, Seoul, 2008

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