How long did it take to clean up 911 debris?

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Tags

1. #after
2. #million
3. #rescue
4. #wreckage
5. #employees
6. #september
7. #attacks
8. #complex
9. #center
10. #additional
11. #through
12. #passed
13. #towers
14. #months
15. #trade
16. #worked
17. #world
18. #clean
19. #workday
20. #recovery
21. #given