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Dewey, M.: Dewey Decimal Classification and relative index (1996)
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Gruppo di lavoro della Bibliografia nazionale italiana: Dewey da 20 a 21 (2001)
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Crocetti, L.; Fagiolini, A.: Classificazione decimale Dewey edizione aggiornata a DDC21 (2001)
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Mitchell, J.S.: DDC21 and beyond : the Dewey Decimal Classification prepares for the future (1995)
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Scott, M.L.: Dewey Decimal Classification, 21st edition : a study manual and number building guide (1998)
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