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Grolier, E. de: ¬A study of general categories applicable to classification and coding in documentation (1962)
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Srivastava, A.P.: Theory of knowledge classification in libraries (1964)
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Ranganathan, S.R.; Gopinath, M.A.: Prolegomena to library classification (1967)
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Soergel, D.E.: Klassifikationssysteme und Thesauri : Eine Anleitung zur Herstellung von Klassifikationssystemen und Thesauri im Bereich der Dokumentation (1969)
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