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Wood, A.J.: OPACs in public libraries : a second look (1989)
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Slack, F.: Subject searching on OPACs : problems and help provision (1991)
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Stone, A.T.: Subject searching in law library OPACs (1989)
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Casson, E.; Fabbrizzi, A.; Slavic, A.: Subject search in Italian OPACs : an opportunity in waiting? (2011)
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Connell, T.H.: Subject cataloging (1996)
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