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![[First flight air mail cover addressed to William E. Boeing]](/img/placeholder.gif?1790288814 "[First flight air mail cover addressed to William E. Boeing]")
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West Coast Airlines, [First flight air mail cover addressed to William E. Boeing], [2005-10-06-B_text_259]. Museum of Flight Digital Collections, accessed 07/10/2026, https://digitalcollections.museumofflight.org/nodes/view/8912