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Wellisch, H.H.: ¬The Universal Decimal Classification : a programmed instruction course (1970)
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Dubuc, R.: ¬La Classification Decimale Universelle (CDU) : Manuel practique d'utilisation (1973)
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Dubuc, R.: Exercices programmés sur la Classification Décimale Universelle (1970)
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Foskett, A.C.: ¬The Universal Decimal Classification : the history, present status and future prospects of a large general classification system (1973)
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Dahlberg, I.: Grundlagen universaler Wissensordnung : Probleme und Möglichkeiten eines universalen Klassifikationssystems des Wissens (1974)
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