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  1. Batty, D.: ¬An introduction to the twentieth edition of the Dewey Decimal Classification (1992) 0.01
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    Footnote
    Rez. in: Knowledge organization 20(1993) no.4, S.232-233 (M.P. Satija)
  2. Mills, J.; Broughton, V.: Bliss Bibliographic Classification : Introduction and auxiliary schedules (1992) 0.01
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    Isbn
    0-408-70865-4