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  • × year_i:[1970 TO 1980}
  1. Wellisch, H.H.: Organisatorische Neuordnung des DK-Systems (1971) 8.61 
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    Wellisch, H.H.
  2. Wellisch, H.H.: UDC: present and potential (1974) 8.61 
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  3. Wellisch, H.H.: ¬The Universal Decimal Classification : a programmed instruction course (1970) 8.61 
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