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Brazda, M.: Zettel-Zentralkatalog NRW jetzt im Internet (2004)
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Jansen, H.: Digitale öffentliche Bibliothek NRW (2001)
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Vogt, W.: ¬Der Bayrische Zentralkatalog (1975)
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Jansen, H.; Wirtz, H.-C.: "Users want unified access" : Die Digitale Öffentliche Bibliothek (2002)
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