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Ballard, T.: Keyword / subject : finding the middle path (1998)
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Tillotson, J.: Is keyword searching the answer? (1995)
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Chan, L.M.: ¬The Library of Congress Classification System in an online environment (1990)
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Delozier, E.P.; Lingle, V.A.: MEDLINE and MeSH (1992)
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Cochrane, P.A.: Subject access - free text and controlled : the case of Papua New Guinea (1985)
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