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Gupta, S.: Decimal Classification System : a bibliography for the period 1876-1994 (1997)
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Strachan, P.D.; Oomes, F.M.H.: Universal Decimal Classification update (1995)
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McIlwaine, I.: Preparing traditional classifications for the future : Universal Decimal Classification (1995)
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McIlwaine, I.C.: Classification schemes : consultation with users and cooperation between editors (1997)
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