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Veyssière, C.: ¬Die Klassifikationen der Stadtbibliotheken Bochum und Duisburg : eine vergleichende Untersuchung zweier ASB-Varianten (1983)
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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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Kolbe, C.: Kritischer Vergleich der Klassifikation der Stadtbibliotheken Bielefeld, Duisburg und Hannover (1973)
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Materialien zum Informationsdienst I : Informationsfragen aus der Stadtbibliothek Duisburg (1972)
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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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