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Kelm, B.; Maassen, B.: Zentrale Dienstleistungen der Deutschen Bibliothek im Bereich der Sacherschließung (1980)
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Kelm, B.; Maassen, B.: Weiterentwicklung der Sacherschließungsarbeit an der Deutschen Bibliothek (1982)
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Maassen, B.: Inhaltserschließung als zentrale Dienstleistung der Deutschen Bibliothek (1980)
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