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Hildreth, C.R.: Are Web-based OPACs more effective retrieval systems than their conventional predecessors? : an experimental study (2000)
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Butterfield, K.: Online Public Access Catalogs (OPACs) (2009)
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Slack, F.: Subject searching on OPACs : problems and help provision (1991)
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Thompson, D.M.: Online public access catalogs and user instruction (1994)
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Sauperl, A.; Saye, J.D.: Have we made any progress? : catalogues of the future revisited (2009)
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