SUBJECTS CLASSIFIED BY DDC
| DDC Class | Core subjects |
|---|---|
| 0 GENERALITIES | Core subjects |
| 1 PHILOSOPHY | Core subjects |
| 2 RELIGION | Core subjects |
| 3 SOCIAL SCIENCES | Core subjects |
| 4 IDIOMES | Core subjects |
| 5 NATURAL SCIENCES | Core subjects |
| 6 TECHNOLOGIES | Core subjects |
| 7 ARTS | Core subjects |
| 8 LITERATURE | Core subjects |
| 9 GEOGRAPHY & HISTORY | Core subjects |