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Bentley, S.; Kent, C.; LaGuardia, C.: Reference sources for the digital age (1995)
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Hawkins, D.T.: Growth trends in the electronic information services market (1993)
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Tedd, L.A.: ¬The changing face of CD-ROM (1995)
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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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Littlejohn, A.: CD-ROM 1991 : the year in review (1992)
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