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Butterfield, K.: Online Public Access Catalogs (OPACs) (2009)
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Long, C.E.: Improving subject searching in Web-based OPACs : evaluation of the problem and guidelines for design (2000)
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Borgman, C.L.: Why are online catalogs still hard to use? (1996)
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Yee, M.M.: System design and cataloging meet the user : user interfaces to online public access catalogs (1991)
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Lam, V.-T.: Enhancing subject access to monographs in Online Public Access Catalogs : table of contents added to bibliographic records (2000)
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