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Tillotson, J.: Is keyword searching the answer? (1995)
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Slack, F.: Subject searching on OPACs : problems and help provision (1991)
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Ensor, P.: Knowledge level of users and nonusers of keyword/Boolean searching on an online public access catalog (1992)
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Gerhan, D.R.: LCSH in vivo : subject searching performance and strategy in the OPAC era (1989)
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Pienaar, R.E.: Enhancement of subject access in online public access catalogues (OPACs) (1989)
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