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Internationale Jugendbibliothek (1949-)(16)
Pugwash Conference on Science and World Affairs (32. : 1982 : Warschau) (1982-)(15)
International Board on Books for Young People(10)
Pugwash Conference on Science and World Affairs (42. : 1992 : Berlin) (1992-)(8)
Pugwash Conference on Science and World Affairs (13, 1964, Karlovy Vary)(7)