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  • × classification_ss:"025.4/31 / dc20"
  1. Comaroni, J.P.; Satija, M.P.: Exercises in the 20th edition of the Dewey Decimal Classification (1990) 0.06 
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  2. Davis, S.W.: DDC 20 workbook : a practical introduction to the Dewey Decimal Classification (1992) 0.05 
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    Footnote
    Rez. in: Knowledge organization 20(1993) no.4, S.232-233 (M.P. Satija)

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