What are three types of pneumoconiosis?

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  4. #rocks
  5. #mineral
  6. #causes
  7. #referred
  8. #there
  9. #black
  10. #silicosis
  11. #separate
  12. #pneumoconiosis
  13. #inhalation
  14. #disease
  15. #three
  16. #silica
  17. #found
  18. #exposure