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Wikipedia:Dewey Decimal System/50
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Dewey Decimal System/50
Dewey Decimal System
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5 Natural Sciences and Mathematics
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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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