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Lehmann, O.; Lehmann, A.: Top-Platzierungen in Suchmaschinen (2002)
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Lehmann, K.: Zu ausgewählten Problemen der neuen Gliederung der Hauptgruppe R Belletristik : Hinweise und Titel (1984)
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Lehmann, K.: ¬Die Klassifikation für Allgemeinbibliotheken (KAB) (1992)
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Lehmann, K.: Einzelfragen der Überarbeitung der KAB/E (1991)
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Lehmann, K.: Zur Klassifizierung von Darstellungen über einzelne Familien (1991)
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Dahlberg, I.: Klassifikation (1993)
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Klassifikation (1984 ff)
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Dorn, G.J.W.: Klassifikation (1980)
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Wolters, G.: Klassifikation (1980-)
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Manecke, H.-J.: Klassifikation (1997)
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