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- Dewey Decimal Classification (DDC) (2)
- 100 Philosophy, parapsychology and occultism, psychology (2)
- 155 Differential and development psychology (2)
- 155.3 Sex psychology; psychology of people by gender or sex, by sexual orientation (2)
- 155.33 Psychology of people by gender or sex (2)
- 155.332 Men (1)
- 155.333 Women (1)
- 155.33 Psychology of people by gender or sex (2)
- 155.3 Sex psychology; psychology of people by gender or sex, by sexual orientation (2)
- 155 Differential and development psychology (2)
- 100 Philosophy, parapsychology and occultism, psychology (2)
Number of items at this level: 0.