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Oh, D.-G.: Comparative analysis of national classification systems : cases of Korean Decimal Classification (KDC) and Nippon Decimal Classification (NDC) (2023)
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Klein, R.D.: ¬The problem of cataloguing world literature using the Nippon Decimal Classification (1994)
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Ishiyama, H.: Outline of the Nippon Decimal Classification, 9th edition : study committee (1992)
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McConnell, F.: Peoples of Melanesia : proposals for revision of DDC 19, Table 5 (1985)
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Berman, S.: DDC 20 : the scam continues (1989)
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