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- Dewey Decimal Classification (DDC) (6)
- 100 Philosophy, parapsychology and occultism, psychology (6)
- 150 Psychology (6)
- 150.1 Philosophy and theory; systems, viewpoints (6)
- 150.19 Systems, schools, viewpoints (6)
- 150.1 Philosophy and theory; systems, viewpoints (6)
- 150 Psychology (6)
- 100 Philosophy, parapsychology and occultism, psychology (6)
Number of items at this level: 0.