Public domain
Safety engineer with rock dust traps to prevent spread of mine explosions. Old Ben number eight. West Frankfort, Illinois
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineSafety engineer with rock dust traps to prevent spread of mine explosions. Old Ben number eight. West Frankfort, Illinois. 1939-01-01. Rothstein, Arthur. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.
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