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  1. Maassen, B.: Inhaltserschließung als zentrale Dienstleistung der Deutschen Bibliothek (1980) 10.09 
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  2. Kelm, B.; Maassen, B.: Zentrale Dienstleistungen der Deutschen Bibliothek im Bereich der Sacherschließung (1980) 10.09 
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  3. Maassen, B.: ¬The PRECIS project of the Deutsche Bibliothek (1984) 10.09 
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  4. Kelm, B.; Maassen, B.: Weiterentwicklung der Sacherschließungsarbeit an der Deutschen Bibliothek (1982) 10.09 
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