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Sokal, R.R.: Classification: purposes, principles, progress, prospects (1974)
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Subject retrieval in the seventies: methods, problems, prospects (1972)
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Beck, H.: Klassifikation und Informationswiedergewinnung : zu aktuellen Problemen aus bibliothekarischer Sicht (1974)
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Beck, H.: Klassifikation und Informationswiedergewinnung : zu aktuellen Problemen aus bibliothekarischer Sicht (1975)
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