Public domain
Screwing on the bit. Hole through which mud is forced from the mud hog may be seen in the bit. Oil well, Kilgore, Texas
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineScrewing on the bit. Hole through which mud is forced from the mud hog may be seen in the bit. Oil well, Kilgore, Texas. 1939-01-01. Lee, Russell. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.
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