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- Source is exactly "The William E. Boeing Sr. Papers (2005-10-06-B), Box 4, Folder 73"
[Caricature drawing of William E. Boeing flying a biplane]
![[Caricature drawing of William E. Boeing flying a biplane]](https://digitalcollections.museumofflight.org/files/square_thumbnails/ea021b11e56bc5933f021663592e84dc.jpg "[Caricature drawing of William E. Boeing flying a biplane]")
Caricature drawing of William E. Boeing flying a biplane, circa 1920s-1940s.Inscription on verso: "Bill Boeing.