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Pugwash Conference on Science and World Affairs (42. : 1992 : Berlin) (1992-)(4)
Pugwash Symposium (13, 1971, Frascati)(4)
Conference on the Marxian Theory of Development (Warszawa, 1962)(3)
Continuation Committee of the World Conference on Faith and Order(3)
Zentral- und Landesbibliothek Berlin (61)