What is the Chicago Water Tower made of?

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Tags

1. #firefighting
2. #control
3. #architect
4. #regulated
5. #water
6. #could
7. #tower
8. #boyington
9. #lemont
10. #addition
11. #built
12. #pressure
13. #inside
14. #standpipe
15. #limestone
16. #william
17. #surges
18. #being
19. #yellowing