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Tenopir, C.; Ennis, L.: ¬The digital reference work of academic libraries (1998)
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Boyett, S.: FirstSearch in public libraries (1994)
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Larson, C.A.: ¬The electronic library and reference (1994)
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Tenopir, C.: Electronic reference options : tracking the changes (1995)
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O'Leary, M.: FirstSearch takes the lead (1992)
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