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Frank, O.: Handbuch der Klassifikation. H.1-12 (1953-1968)
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Hilgenberg, O.C.: ¬Der flächenhafte Realkatalog mit Dezimalklassifikation und Schlagwortregister (1953)
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Walther, C.: Wie Deutschland zur Dezimalklassifikation kam (1957)
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Hilgenberg, O.C.: Zur Entstehung der Dezimalklassifikation (1952)
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Donker-Duyvis, F.: ¬Die Organisation für den Aufbau der Dezimalklassifikation (1950)
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