Public domain
Tennessee Valley Authority. Railroad crews at Watts Bar Dam. The engineer, or "hog head" of a freight locomotive hauling materials for the building of TVA's Watts Bar Dam, oils the guides of the main driving rods of his engine. Long mechanical experience, practical railroad training and common sense
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Credit lineTennessee Valley Authority. Railroad crews at Watts Bar Dam. The engineer, or "hog head" of a freight locomotive hauling materials for the building of TVA's Watts Bar Dam, oils the guides of the main . 1942-01-01. Palmer, Alfred T., United States. Office Of War Information. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.
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