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![[Boeing Model 40B and Boeing Model 40C]](/img/placeholder.gif?1761170956 "[Boeing Model 40B and Boeing Model 40C]")
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[Boeing Model 40B and Boeing Model 40C], [2008-03-31_image_667]. Museum of Flight Digital Collections, accessed 07/11/2025, https://digitalcollections.museumofflight.org/nodes/view/10845