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Rayward, W.B.: ¬The UDC and FID: a historical perspective (1967)
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- Geschichte der Klassifikationssysteme
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Kyle, B.: ¬The Universal Decimal Classification : a study of the present position and future developments (1961)
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- Geschichte der Klassifikationssysteme
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Ranganathan, S.R.: Library classification on the march (1961)
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- Geschichte der Klassifikationssysteme
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Ranganathan, S.R.: Library classification through a century (1965)
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- Geschichte der Klassifikationssysteme