Dewey Decimal System A system used in libraries for organizing nonfiction works into categories.
000-099 General Works 001.9 Weird Stuff like UFO & Loch Ness Monster 001.6 Computers 004 The Internet 020 Libraries 060 Museums 070 Newspapers
100-199 Philosophy & Psychology 133.1 Ghosts 133.5 Astrology 152.1 Optical Illusions 152.4 Feelings 158 Friendship
200-299 Religion & Mythology 200 Bible Stories 280 Christianity Roman Mythology 292 Greek Mythology Judaism Islam
300-399 Social Sciences 305.8 Native Americans 306 Families 307 Communities 320’s Government 330’s Careers 332.4 Money 355-359 Army & Navy 363 Environment 363.23 Police 363.37 Firemen 394.2 Holidays 398.2 Folklore 398.2 Fairy Tales
400-499 Languages 419 Sign Language 423 Dictionaries 430 German 440 French 450 Italian 460 Spanish 461.7 Russian 492 Hebrew 495.1 Chinese 495.6 Japanese
500-599 Math & Science 507.8 Science Experiments 510’s Math 520’s Planets & Stars 537 Electricity 549 Rocks & Minerals 551.2 Volcanoes 551.5 Weather 567.9 Dinosaurs 582 Trees 595.4 Spiders 595.7 Insects 597.06 Fish 597.3 Sharks 597.6 Amphibians 597.9 Reptiles 598.2 Birds 599 Mammals 599.1 Platypus 599.2 Marsupials 599.3 Rodents, rabbits, anteaters 599.4 Bats 599.5 Whales & dolphins 599.6 Elephants 599.7 Carnivores 599.8 Primates
600-699 Applied Science (Technology) 635 Gardening 636.1 Horses 636.2 Cows & llamas 636.3 Sheep & goats 636.4 Pigs 636.5 Poultry 636.7 Dogs 636.8 Cats 636.9 Rabbits, Gerbils 641.5 Cookbooks 600 The way things work 608 Inventions 610’s The body 623 Boats 625 Trains 629’s Vehicles: Airplanes, Helicopters, Cars, Trucks, Spacecraft
700-799 Arts & Recreation 741 How to draw 745.5 Crafts 784 Song books 792.8 Ballet 793.8 Magic Tricks 794 Games 796.2 Skateboarding 796.32 Basketball 796.33 Football 796.334 Soccer 796.357 Baseball 796.962 Hockey 796.7 Auto racing 796.8 Martial Arts 796.9 Snowboarding 798.2 Horseback Riding
800-899 Literature 808 How to Write 808.81 Poetry Collections 808.83 Short Stories 811 American Poetry 812 Theater 818.54 Jokes and Riddles
900-999 History, Geography, Biography 910.4 Shipwrecks 910.4 Pirates & Explorers 912 Atlases 914-916 Countries 917 United States 917.74 Michigan 920 Biographies 929.9 Flags 932 Ancient Egypt & Mummies 937 Roman History 938 Greek History 940 Middle Ages and Knights 973 US History 978 Cowboys & the Wild West 998 Arctic & Antarctica