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Broadbent, E.: ¬The online catalog : dictionary, classified, or both? (1989)
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Cutter, C.A.: Subjects (1985)
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Mischo, W.H.: Library of Congress Subject Headings : a review of the problems, and prospects for improved subject access (1981)
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Main, E.: ¬A survey of online dictionaries (1998)
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Nelson, M.J.: Correlation of term usage and term indexing frequencies (1988)
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