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Internationaler Historikerkongreß (11, 1960, Stockholm)(5)
Conference on the Marxian Theory of Development (Warszawa, 1962)(4)
Pugwash Conference on Science and World Affairs (42. : 1992 : Berlin) (1992-)(4)
Pugwash Symposium (13, 1971, Frascati)(4)
Continuation Committee of the World Conference on Faith and Order(3)
Zentral- und Landesbibliothek Berlin (70)