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Langfeldt, J.: Zum Problem und zur Geschichte der Systematik : T.1-2. (1957)
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Hilgenberg, O.C.: Zur Entstehung der Dezimalklassifikation (1952)
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- Geschichte der Klassifikationssysteme
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Fuchs, W.: Zur Systematik und sogenannten Einheit der Wissenschaften : zugleich eine kritische Auseinandersetzung mit Eduard Spranger: 'Die Einheit der Wissenschaft, ein Problem' (1954)
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Vickery, B.C.: ¬The significance of John Wilkins in the history of bibliographical classification (1953)
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- Geschichte der Klassifikationssysteme
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Hulme, E.W.: Principles of book classification (1950)
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