Are there still coal miners?

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Tags

  1. #since
  2. #industry
  3. #miners
  4. #mining
  5. #declined
  6. #improved
  7. #employment
  8. #production
  9. #approximately
  10. #mechanization
  11. #greatly
  12. #productivity
  13. #there
  14. #increased
  15. #employed
  16. #peaked