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Tillotson, J.: Is keyword searching the answer? (1995)
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Stone, A.T.: Subject searching in law library OPACs (1989)
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Ballard, T.: Keyword / subject : finding the middle path (1998)
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Peters, T.A.; Kurth, M.: Controlled and uncontrolled vocabulary subject searching in an academic library online catalog (1991)
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Chan, L.M.: ¬The Library of Congress Classification System in an online environment (1990)
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