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  • × classification_ss:"025.4/31 / dc20"
  1. Davis, S.W.: DDC 20 workbook : a practical introduction to the Dewey Decimal Classification (1992) 10.60 
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  2. Comaroni, J.P.; Satija, M.P.: Exercises in the 20th edition of the Dewey Decimal Classification (1990) 10.60 
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