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Alex, H.: Dewey in Germany (2007)
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Alex, H.: ¬Die Dewey-Dezimalklassifikation (DDC) (2018)
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Alex, W.; Bernör, G.: Unix, C und Internet : Moderne Datenverarbeitung in Wissenschaft und Technik (1994)
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Alex, H.; Heiner-Freiling, M.: DDC-Sachgruppen der Deutschen Naitonalbibliografie : Leitfaden zu ihrer Vergabe (2003)
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Usemann-Keller, U.: Round-table zum Online-Auskunftsdienst (1996)
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EDUG's recommendations for best practice in mapping involving Dewey Decimal Classification (DDC) (2015)
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