Public domain
North American aviation, inc., Inglewood, Calif(?). 1942(?). A mechanic testing the power of a R-51 "Mustang" fighter plane
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineNorth American aviation, inc., Inglewood, Calif(?). 1942(?). A mechanic testing the power of a R-51 "Mustang" fighter plane. 1942-01-01. Lownds, Mead Maddick. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.