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# Identify books in library

![The number by which a book is identified](/files/-MSpSnvzBbbLef9on6hV)

Dewey decimal system - books in a library are arranged by subject. These codes can be committed to memory.

### Codes

Reference: <https://archive.org/details/decimal18v2dewe>

| #   | Subject                                        |
| --- | ---------------------------------------------- |
| 000 | Computer science, information and general work |
| 100 | Philosophy and psychology                      |
| 200 | Religion                                       |
| 300 | Social Sciences                                |
| 400 | Language                                       |
| 500 | Science                                        |
| 600 | Technology                                     |
| 700 | Art and recreation                             |
| 800 | Literature                                     |
| 900 | History and geography                          |