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  1. Hilgenberg, O.C.: ¬Der flächenhafte Realkatalog mit Dezimalklassifikation und Schlagwortregister (1953) 10.60 
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    Hilgenberg, O.C.
  2. Hilgenberg, O.C.: Zur Entstehung der Dezimalklassifikation (1952) 10.60 
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