Public domain
De-waxing plant at Mid-Continent refinery, Tulsa, Okla.
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineDe-waxing plant at Mid-Continent refinery, Tulsa, Okla.. 1939. Vachon, John. FSA/OWI Color Photographs, Library of Congress. Public domain.