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language_ss:"e"
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subject_ss:"Reference books / Bibliography"
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theme_ss:"Bibliographie"
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theme_ss:"Informationsdienstleistungen"
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theme_ss:"Informationsmittel"
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type_ss:"m"
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year_i:[1990 TO 2000}
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Katz, W.A.: Introduction to reference work : Vol.1: Basic information sources; vol.2: Reference services and reference processes (1992)
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