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