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  1. ETHICS: Detailanleitung zur On-line Abfrage; Titelwortabfrage und Sachabfrage. Stand: 30.7.1987 (1987) 0.02 
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    Theme
    Klassifikationssysteme im Online-Retrieval
  2. Bauer, P.: Information Retrieval in externen allgemeinbibliographischen Online-Datenbanken : eine Einführung in die Praxis des Information Retrieval sowie Materialiensammlung zur Nutzung der Zeitschriftendatenbank (Online-Version) und von BIBLIO-DATA (1989) 0.01 
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  3. Schmidt, K.; Walser, M.: ETHICS: Anleitung für die Katalogabfrage und die Ausleihe (1989) 0.01 
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    Theme
    Klassifikationssysteme im Online-Retrieval

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