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- Source is exactly "The William E. Boeing Sr. Papers (2005-10-06-B), Box 3, Folder 79"
[Air mail postcard addressed to William E. Boeing, Seattle, Washington, from Des Moines Post Office, Iowa, August 10, 1928]
![[Air mail postcard addressed to William E. Boeing, Seattle, Washington, from Des Moines Post Office, Iowa, August 10, 1928]](https://digitalcollections.museumofflight.org/files/square_thumbnails/3b1665d6d3e1c34445bd116b30b04d79.jpg "[Air mail postcard addressed to William E. Boeing, Seattle, Washington, from Des Moines Post Office, Iowa, August 10, 1928]")
Air mail postcard addressed to William E. Boeing, Seattle, Washington, from the Des Moines Post Office, Iowa, August 10, 1928. Text reads: "Congratulations - Des Moines, IA today dispatched more than 40,000 pieces of air mail via Boeing planes for a…