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- Dewey Decimal Classification (DDC) (3)
- 100 Philosophy, parapsychology and occultism, psychology (3)
- 171 Ethical systems (3)
- 171.4 Hedonism (2)
- 171 Ethical systems (3)
- 100 Philosophy, parapsychology and occultism, psychology (3)
Number of items at this level: 0.