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  • × author_ss:"Wellisch, H.H."
  1. Wellisch, H.H.: Organisatorische Neuordnung des DK-Systems (1971) 5.98 
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  2. Wellisch, H.H.: UDC: present and potential (1974) 5.98 
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  3. Wellisch, H.H.: ¬The Universal Decimal Classification : a programmed instruction course (1970) 5.98 
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