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Veyssière, C.: ¬Die Klassifikationen der Stadtbibliotheken Bochum und Duisburg : eine vergleichende Untersuchung zweier ASB-Varianten (1983)
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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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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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Ruppert, E.: Grundlagen des Auskunftsdienstes in Stadtbibliotheken (1985)
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