history

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Across
  1. 3. stuff miners mine for
  2. 5. huge machines
  3. 6. cars move on it
  4. 8. to help trains
  5. 9. not clean
Down
  1. 1. a way to access good air in factories
  2. 2. people who work
  3. 4. it pumps water out of mines
  4. 7. not safe not one bit