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  • × author_ss:"Wellisch, H.H."
  • × year_i:[1970 TO 1980}
  1. Wellisch, H.H.: Organisatorische Neuordnung des DK-Systems (1971) 0.02 
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    Source
    Nachrichten für Dokumentation. 22(1971), S.55-63
  2. Wellisch, H.H.: ¬The Universal Decimal Classification : a programmed instruction course (1970) 0.01 
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