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Lipow, A.G.: ¬The virtual reference librarian's handbook (2003)
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Erben, K.M.: ¬Das Internet wird menschlich : Web-Guides sind die neuen Pfadfinder im Dschungel des Netzes (2001)
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Buchner, M.: ¬Die Machete im Dschungel : Persönliche Auskunftsdienste: "Hier werden Sie geholfen" - Ratgeber sind die neue Konkurrenz für Internet-Suchmaschinen (2001)
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