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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)
Pugwash Conference on Science and World Affairs (22, 1972, Oxford)(3)
Pugwash Conference on Science and World Affairs (32. : 1982 : Warschau) (1982-)(3)
Zentral- und Landesbibliothek Berlin (66)