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![[National Aeronautic Association glider's certificate for Bill Cook]](/img/placeholder.gif?1762303493 "[National Aeronautic Association glider's certificate for Bill Cook]")
National Aeronautic Association (U.S.), [National Aeronautic Association glider's certificate for Bill Cook], [2017-10-26_text_055]. Museum of Flight Digital Collections, accessed 09/02/2026, https://digitalcollections.museumofflight.org/nodes/view/19494