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Numminen, P.; Vakkari, P.: Question types in public libraries' digital reference service in Finland : comparing 1999 and 2006 (2009)
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Childers, T.A.: Using public library reference collections and staff (1997)
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Duckett, R.J.; Walker, P.; Donnelly, C.: Know it all, find it fast : an A-Z source guide for the enquiry desk (2008)
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Jumonville, F.M.: ¬The role of the state in the organization of statewide library service : Essae M. Culver, Louisiana's first state librarian (2004)
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Dearie, T.N.; Perez, A.J.: Traditional access to the library via telephone service (1992)
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