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Subject retrieval in the seventies: new directions : Proc. of an Int. Symp. ... College Park, 14.-15.5.1971 (1972)
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Classification in the 1970s. A second look (1976)
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Dahlberg, I.: Grundlagen universaler Wissensordnung : Probleme und Möglichkeiten eines universalen Klassifikationssystems des Wissens (1974)
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McIlwaine, I.C.: ¬The Universal Decimal Classification : a guide to its use (2000)
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Batley, S.: Classification in theory and practice (2005)
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