Encyclopedia > Wikipedia:Dewey Decimal System 50

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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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