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This original ad was taken from the National Geographic Magazine, Aug 1942. It describes the Research work being carried out by Boeing so that aircraft and en could operate at 35,000 feet This ad is in good condition considering its age. Any wavy lines or rainbow effect are a result of the scan. We do accept electronic payments through Paypal only, Money Orders or personal checks. Purchaser pays $2.25 First Class Shipping and Handling. Quoted S/H is for Domestic US only, we will requote Foreign S/H.
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