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- Dewey Decimal Classification (DDC) (10)
- 100 Philosophy, parapsychology and occultism, psychology (10)
- 155 Differential and development psychology (10)
- 155.5 Psychology of young people twelve to twenty (10)
- 155.51 General topics of psychology of young people twelve to twenty (10)
- 155.5 Psychology of young people twelve to twenty (10)
- 155 Differential and development psychology (10)
- 100 Philosophy, parapsychology and occultism, psychology (10)
Number of items at this level: 0.