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Lowery, J.: Online bibliographic services from The British Library's National Bibliographic Service (1997)
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OPACs: an overview (1993)
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Brown, J.M.: ¬The multifile OPAC environment : a manageable approach to developing an instruction program (1993)
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Hancock-Beaulieu, M.: ¬A comparative transaction log analysis of browsing and search formulation in online catalogues (1993)
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Ashton, J.: ¬The British Library Network OPAC (1994)
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