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Wood, A.J.: OPACs in public libraries : some results of a survey (1989)
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Thompson, D.M.: Online public access catalogs and user instruction (1994)
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Pienaar, R.E.: Enhancement of subject access in online public access catalogues (OPACs) (1989)
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Ramesh Babu, B.; Tamizhchelvan, M.: ¬An investigation into the features of OPACs in Tamil Nadu (India) (2003)
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Guidelines for Online Public Access Catalogue (OPAC) Displays : Final Report May 2005. Recommended by the IFLA Task Force on Guidelines for OPACD Displays. Approved by the Standing Committee of the IFLA Cataloguing Section (2005)
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