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Grasberger, F.: Systematischer Schlagwortkatalog (1951)
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Rider, F.: ¬The story of D.C., 1876-1951 (1951)
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Penalosa, F.: ¬A card catalog : a failure in communication (1956)
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Donker-Duyvis, F.: ¬Die Organisation für den Aufbau der Dezimalklassifikation (1950)
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