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![[Letter and first flight air mail cover addressed to William E. Boeing and Bertha Boeing]](/img/placeholder.gif?1762292655 "[Letter and first flight air mail cover addressed to William E. Boeing and Bertha Boeing]")
Brown, Gordon D., [Letter and first flight air mail cover addressed to William E. Boeing and Bertha Boeing], [2005-10-06-B_text_256]. Museum of Flight Digital Collections, accessed 17/01/2026, https://digitalcollections.museumofflight.org/nodes/view/8907