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Larson, R.R.: ¬The decline of subject searching : long-term trends and patterns of index use in an online catalog (1991)
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Voorbij, H.: Title keywords and subject descriptors : a comparison of subject search entries of books in the humanities and social sciences (1998)
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Akeroyd, J.: Information seeking in online catalogues (1990)
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Wallace, P.M.: Optimizing serials access in the online catalog (1996)
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Tillotson, J.: Is keyword searching the answer? (1995)
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