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Nofsinger, M.M.; Bosch, A.W.: Roles of the head of reference : from the 1990s to the 21st century (1994)
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Harnack, A. von: ¬Die Auskunftserteilung als bibliothekarische Aufgabe (1940)
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Metz, A.: Community service : a bibliography (1996)
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Ulrich, P.S.: Collaborative Digital Reference Service : Weltweites Projekt (2001)
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Ghilardi, F.J.M.: ¬The information center of the future : the professional's role (1994)
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