| Code | Description | Items |
|---|---|---|
| 180 | Ancient, medieval, Oriental philosophy | 34 |
| 181 | Oriental philosophy | 85 |
| 182 | Pre-Socratic Greek philosophies | 32 |
| 183 | Sophistic & Socratic philosophies | 25 |
| 184 | Platonic philosophy | 96 |
| 185 | Aristotelian philosophy | 55 |
| 186 | Skeptic and Neoplatonic philosophies | 21 |
| 187 | Epicurean philosophy | 17 |
| 188 | Stoic philosophy | 24 |
| 189 | Medieval Western philosophy | 57 |