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Vienna on May 1st 1990: UN-Secretary General Perez de Cuellar (r.) spent five days in Vienna to take part at a a meeting of the administration and co-ordination agency of the UN. In the picture: Cuellar and his forerunner, Federal President Kurt Waldheim (l.). - 19900501_PD0007 (KEYSTONE/APA/Kurt Keinrath)