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Williamson, N.J.: ¬The Library of Congress Classification : problems and prospects in online retrieval (1986)
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Williamson, N.J.: ¬The Library of Congress Classification and the computer: research in progress (1989)
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Williamson, N.J.: ¬The role of classification in online systems (1989)
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Williamson, N.J.: Classification in online systems : research and the North American perspective (1985)
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Williamson, N.J.: ¬The Library of Congress Classification in the computer age (1989)
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