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classification_ss:"01.20 / Allgemeine Nachschlagewerke: Allgemeines"
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subject_ss:"Bibliothek / Auskunftsdienst (SWB)"
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subject_ss:"Bibliothek / Informationsvermittlung (GBV)"
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theme_ss:"Informationsdienstleistungen"
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Reference and information services : an introduction (2001)
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