Public domain
Greenville, South Carolina. Air Service Command. Instructor conducting a class on the Pratt and Whitney engine at the 35th squadron engineering line
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineGreenville, South Carolina. Air Service Command. Instructor conducting a class on the Pratt and Whitney engine at the 35th squadron engineering line. 1943-01-01. Delano, Jack. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.
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