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Information sources in official publications (1997)
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Gray, A.S.; Geraci, D.: Complex reference services : data files for social research (1995)
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Etkin, C.: Creating a core knowledge for electronic reference services (1995/96)
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Smith, K.F.: POINTER vs. Using Government publications : where's the advantage? (1989)
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Edwin, A.; Fleming, D.: Reference and information services (1992)
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