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- Dewey Decimal Classification (DDC) (9)
- 600 Technology (Applied sciences) (9)
- 616 Diseases (9)
- 616.2 Diseases of respiratory system (9)
- 616.23 Diseases of trachea and bronchi (9)
- 616.238 Asthma (9)
- 616.23 Diseases of trachea and bronchi (9)
- 616.2 Diseases of respiratory system (9)
- 616 Diseases (9)
- 600 Technology (Applied sciences) (9)
Number of items at this level: 0.