1. Dewey Decimal System A system used in libraries for organizing nonfiction works into categories.

2. 000-099 General Works 001.9Weird Stuff like UFO & Loch Ness Monster 001.6Computers 004The Internet 020Library 060Museums 070Newspapers

3. 100-199 Philosophy & Psychology 133.1Ghosts 133.5Astrology 152.1Optical Illusions 152.4Feelings 158Friendship

4. 200-299 Religion & Mythology 200Bible Stories 280Christianity 290 Mythology 292 Roman Mythology 292Greek Mythology 296 Judaism 297 Islam

5. 300-399 Social Sciences 305.8Native Americans 306Families 307Communities 320’sGovernment 330’sCareers 332.4Money 355-359Army & Navy 363Environment 363.23Police 363.37Firemen 394.2Holidays 398.2Folklore 398.2 Fairy Tales

6. 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

7. 500-599 Math & Science 507.8Science Experiments 510’sMath 520’sPlanets & Stars 537Electricity 549Rocks & Minerals 551.2Volcanoes 551.5Weather 567.9Dinosaurs 582Trees 595.4Spiders 595.7Insects 597.06Fish 597.3Sharks 597.6Amphibians 597.9Reptiles 598.2Birds 599Mammals 599.1Platypus 599.2Marsupials 599.3Rodents, rabbits, anteaters 599.4Bats 599.5Whales & dolphins 599.6Elephants 599.7Carnivores 599.8Primates

8. 600-699 Applied Science (Technology) 600 The way things work 608Inventions 610’sThe body 623Boats 625Trains 629’sVehicles: Airplanes, Helicopters, Cars, Trucks, Spacecraft 635Gardening 636.1Horses 636.2Cows & llamas 636.3Sheep & goats 636.4Pigs 636.5Poultry 636.7Dogs 636.8Cats 636.9Rabbits, Gerbils 641.5Cookbooks

9. 700-799 Arts & Recreation 741How to draw 745.5Crafts 784Song books 792.8Ballet 793.8Magic Tricks 794 Games 796.2Skateboarding 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

10. 800-899 Literature 808 How to Write 808.81 Poetry 808.83 Short Stories 811 American Poetry 812 Theater 818.54 Jokes and Riddles

11. 900-999 History, Geography, Biography 910.4 Shipwrecks 910.4 Pirates & Explorers 912 Atlases 914-916 Countries 917 United States 917.74 Michigan 929.9 Flags 932Ancient Egypt & Mummies 937Roman History 938Greek History 940Middle Ages and Knights 973US History 978Cowboys & the Wild West 998Arctic & Antarctica