You can get planks from the lumber mill , this will come up in a non limited edition quest .
I am at level 185. Have I missed somehow the lumber I'll and steel foundry
185 does seem a bit high to not have the mill and foundry. You may want to submit a trouble ticket.
How do I put in a trouble ticket?
Please drop an email to our support team with the details of the issue in the game. We are here to assist you. Please write to us via support.rockyou.com
It's within the game settings
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