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Stone, A.T.: Subject searching in law library OPACs (1989)
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Poo, D.C.C.; Khoo, C.S.G.: Online Catalog Subject Searching (2009)
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Jakobsen, E.: On-line public access catalogue (1992)
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OPACs: an overview (1993)
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Frâncu, V.: ¬A universal classification system going through changes (2001)
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