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Smith, D.R.: Collection development for telephone reference (1993)
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Dearie, T.N.; Perez, A.J.: Traditional access to the library via telephone service (1992)
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Revelli, C.: ¬Le informazioni in biblioteca (1997)
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Pernat, M.: Developing a reference telephone inquiries service (1994)
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Lavin, M.R.: Improving the quality of business reference service (1995)
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