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Actually, some of the challenges you describe might not be too hard to overcome. Maybe you've thought of the same things I have. Metals I'll tackle smelting first. The key issue you described is ...
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#1: Attribution notice removed
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System
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2020-06-01T14:13:37Z (over 4 years ago)
Source: https://worldbuilding.stackexchange.com/a/1083 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/