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Abb. 13: Top level classes of the DDC (according to http://www.oclc.org/oclc/fp/about/ddc21sm1.htm)

0 Generalities
1 Philosophy & psychology
2 Religion
3 Social sciences
4 Language
5 Natural sciences & mathematics
6 Technology (Applied sciences)
7 The arts, Fine and decorative arts
8 Literature & rethoric
9 Geography & history

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