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- Source is exactly "The William E. Boeing Sr. Papers (2005-10-06-B), Box 4, Folder 15"
[Commemorative air mail cover addressed to Bill Boeing, Jr., Seattle, Washington, from William E. Boeing, May 19, 1938]
![[Commemorative air mail cover addressed to Bill Boeing, Jr., Seattle, Washington, from William E. Boeing, May 19, 1938]](https://digitalcollections.museumofflight.org/files/square_thumbnails/cf180de562050a698d5aa85c2e12ab82.jpg "[Commemorative air mail cover addressed to Bill Boeing, Jr., Seattle, Washington, from William E. Boeing, May 19, 1938]")
Commemorative air mail cover addressed to Bill Boeing, Jr., Seattle, Washington, from William E. Boeing, May 19, 1938.Stamped cachet: "20th anniversary of the inauguration of regular air mail service - First National Air Mail Week - May 15-21, 1938 -…