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Abb. 14: Level 2 classes of the DDC (according to http://www.oclc.org/oclc/fp/about/ddc21sm2.htm)

51 Mathematics
52 Astronomy & allied sciences
53 Physics
54 Chemistry & allied sciences
55 Earth sciences
56 Paleontology Paleozoology
57 Life sciences biology
58 Plants
59 Animals

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