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Stock, W.G.: Qualitätskriterien von Suchmaschinen : Checkliste für Retrievalsysteme (2000)
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Beck, H.: Klassifikation und Informationswiedergewinnung : zu aktuellen Problemen aus bibliothekarischer Sicht (1974)
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Beck, H.: Klassifikation und Informationswiedergewinnung : zu aktuellen Problemen aus bibliothekarischer Sicht (1975)
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Beck, H.: Klassifikation und Informationswiedergewinnung : zu aktuellen Problemen aus bibliothekarischer Sicht (1976)
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Beck, H.: Klassifikation und Informationswiedergewinnung : zu aktuellen Problemen aus bibliothekarischer Sicht (1977)
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Beck, H.: Klassifikation und Informationswiedergewinnung : zu aktuellen Problemen aus bibliothekarischer Sicht (1979)
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Beck, H.: Klassifikation und Informationswiedergewinnung : zu aktuellen Problemen aus bibliothekarischer Sicht (1979)
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