Why was salt so valuable?

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Tags

1. #purpose
2. #harvest
3. #seasoning
4. #commodity
5. #expensive
6. #preservation
7. #extremely
8. #built
9. #industrialization
10. #intensive
11. #during
12. #along
13. #quantities
14. #especially
15. #labor
16. #roads
17. #transported
18. #prior
19. #middle
20. #necessary
21. #valuable