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Wood, A.J.: OPACs in public libraries : a second look (1989)
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Thompson, D.M.: Online public access catalogs and user instruction (1994)
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Butterfield, K.: Online Public Access Catalogs (OPACs) (2009)
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Lee, Y.Y.; Yang, S.Q.: Folksonomies as subject access : a survey of tagging in library online catalogs and discovery layers (2012)
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