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Wikipedia:Dewey Decimal System/50
Dewey Decimal System > 5 Natural Sciences and Mathematics > 50 Natural Sciences and Mathematics
- 500 Natural Sciences and Mathematics[?]
- 501 Philosophy and theory[?]
- 502 Miscellany[?]
- 503 Dictionaries & encyclopedias[?]
- 504 Not Used
- 505 Serial publications[?]
- 506 Organizations & management[?]
- 507 Education, research, related topics[?]
- 508 Natural history[?]
- 509 Historical, areas, persons treatment[?]
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