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Rolland-Thomas, P.: Dewey Decimal Classification edition 20 : a critical review (1991)
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Mitchell, J.S.: Dewey Decimal Classification edition 20 : an overview of the changes (1991)
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Dewey lives! in the new DDC 20 (1989)
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Redfern, B.: On first looking into Dewey Decimal Classification 20, class 780 : a review article (1991)
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Dewey: an international perspective : papers from a workshop on the Dewey Decimal Classification and DDC20 (1991)
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