Dewey Decimal Classification/Catalogs

Dewey Decimal Classification divides knowledge into ten main discipline areas, which are represented by ten classes. These ten classes are called the First Summary.

First Summary

 * 000 Computer science, information, and general works
 * 100 Philosophy and psychology
 * 200 Religion
 * 300 Social sciences
 * 400 Language
 * 500 Science
 * 600 Technology
 * 700 Arts and recreation
 * 800 Literature
 * 900 History and geography