| Term | Definition |
| 000 | General Information: Encyclopedias, computers, libraries, museums |
| 100 | Psychology and Philosophy: Ghosts, Dreams, Supernatural, Logic |
| 200 | Religion: Bible stories, mythology, world religions |
| 300 | Social Science: Money, Transportation, Folklore |
| 400 | Language: Foreign languages, dictionaries |
| 500 | Science and Mathematics: Biology, Weather, Insects, Animals, Electricity |
| 600 | Technology: Applied Science, Pet Care, Health, cookbooks |
| 700 | Arts and Recreation: Sports, Music, Art, Drawing, and Crafts |
| 800 | Literature: Plays, Poetry, Jokes, Short Stories |
| 900 | History and Geography: Explorers, Countries, Ancient Cultures, Collective Biographies |