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https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/14305251

Abandoned Mine Showing how Prop Timber Is Used to Support Roofs of Tunnels, Scranton, Pa., U.S.A. by Keystone View Co

Original public domain image from Getty Museum

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Abandoned Mine Showing how Prop Timber Is Used to Support Roofs of Tunnels, Scranton, Pa., U.S.A. by Keystone View Co

More