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Subrahmanyam, B.: Library of Congress Classification numbers : issues of consistency and their implications for union catalogs (2006)
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McJunkin, M.C.: Precision and recall in title keyword searching (1995)
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Broadbent, E.: Classification access in the online catalog (1995)
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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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