Dewey Decimal System
000-099
Computer Science, Information, General Works
Big Foot & Other Mysteries, Computers & the Internet, Journalism
100-199
Philosophy & Psychology
Supernatural, Astrology, Emotions & Feelings
200-299
Religion
Comparative Religions, Mythology
300-399
Social Sciences
Holidays, Folktales, Fairytales, Environmental issues, Government, Politics, Social Problems
400-499
Language
Dictionary, Sign Language, Foreign Language
500-599
Science
Fossils, Dinosaurs, Biology, Astronomy, Planets & Stars, Geology & Weather
600-699
Technology
Inventions, Human Body & Health, Space, Technology & Robots
700-799
Arts & Recreation
Arts, Crafts, Music, Sports
800-899
Literature
Writing, Poetry, Plays
900-999
History & Geography
Geography & Travel, Ancient Worlds, States