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  1. Alex, H.; Heiner-Freiling, M.: DDC-Sachgruppen der Deutschen Nationalbibliografie : Leitfaden zu ihrer Vergabe (2004) 10.09
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  2. Leitfaden zur DDC-Sachgruppenvergabe erschienen (2004) 10.09
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  3. Einheitliche Regeln für Erschließung der Nationalbibliographien (2004) 10.09
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  4. Maschinelle Suchgruppenvergabe (2012) 10.09
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