Public domain
Oil field worker working on the mud hog, a machine which pumps the mud from the sluch pit through the drill pipe to the bit, Kilgore, Texas
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineOil field worker working on the mud hog, a machine which pumps the mud from the sluch pit through the drill pipe to the bit, Kilgore, Texas. 1939-01-01. Lee, Russell. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.