Müller, A.: ¬Die Klassifikationen der Stadtbibliotheken Duisburg und Hannover : kritische Untersuchung der Neubearbeitungen unter dem Gesichtspunkt der Eignung beider Systeme als Grundlage für eine Normklassifikation in Öffentlichen Bibliotheken (1974)
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Kolbe, C.: Kritischer Vergleich der Klassifikation der Stadtbibliotheken Bielefeld, Duisburg und Hannover (1973)
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