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Dost, C.: ¬Der Informationsdienst im System der Stadtbibliotheken Duisburg und Köln : eine vergleichende Untersuchung der Konzeptionen und der Informationsbestände (1985)
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Kolbe, C.: Kritischer Vergleich der Klassifikation der Stadtbibliotheken Bielefeld, Duisburg und Hannover (1973)
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Enz, H.: Informationsdienst in Mittelstadtbibliotheken : Vergleichende Untersuchung von Konzeption, Organisation und Bestand der Stadtbibliotheken Düren, Moers und Siegburg (1991)
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Schmidt, S.: Kritische Untersuchnung der Neubearbeitungen unter dem Gesichtspunkt der Eignung beider Systeme als Grundlage für eine Normklassifikation in Öffentlichen Bibliotheken : ¬Die Klassifikationen der Stadtbibliotheken Duisburg und Hannover (1974)
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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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