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Mortimer, M.: Learn Dewey Decimal classification (Edition 21) (2000)
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Mitchell, J.S.; Vizine-Goetz, D.: DDC taxonomy server (2000)
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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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