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  • × author_ss:"Helbig, G."
  • × type_ss:"h"
  • × year_i:[1980 TO 1990}
  1. Fröschner, G.; Helbig, G.; Schulz, H.: Richtlinie für die Adaption der sowjetischen Bibliothekarisch-bibliographischen Klassifikation (1981) 0.03
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