Public domain
Timber-shored tunnel into mine, San Juan County, Colorado. Much timber is required in mine tunnel construction and mill work
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineTimber-shored tunnel into mine, San Juan County, Colorado. Much timber is required in mine tunnel construction and mill work. 1940-01-01. Lee, Russell. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.
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