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Fröschner, G.; Helbig, G.; Schulz, H.: Richtlinie für die Adaption der sowjetischen Bibliothekarisch-bibliographischen Klassifikation (1981)
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Helbig, G.: Zuordnungen und Abgrenzungen der Sachgebiete bei den naturwissenschaftlich-technischen Hauptgruppen im Rahmen der zentralen Adaption der BBK (1984)
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