7x12.5" one-page, four-fold. Front shows a photo of the 9-cyl engine, inside is text, engine specs and extensive description of operation. Back page shows records by Byrd, Lindbergh, Chamberlin and Maitland using the Whirlwind. Very good.
7x12.5" one-page, four-fold. Front shows a photo of the 9-cyl engine, inside is text, engine specs and extensive description of operation. Back page shows records by Byrd, Lindbergh, Chamberlin and Maitland using the Whirlwind. Very good.
