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Sweeney, R.: Dewey Decimal Classification : edition 20 (1989)
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Sifton, P.: Workbook for DDC20 : a practical introduction to Dewey Decimal Classification; Edition 20; 1989 (1989)
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Dewey, M.: Dewey Decimal Classification and relative index (1989)
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Berman, S.: DDC 20 : the scam continues (1989)
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