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- Source is exactly "The William E. Boeing Sr. Papers (2005-10-06-B), Box 3, Folder 90"
[Letter and air mail cover addressed to William E. Boeing from W. Irving Glover, Second Assistant Postmaster General, June 3, 1930]
![[Letter and air mail cover addressed to William E. Boeing from W. Irving Glover, Second Assistant Postmaster General, June 3, 1930]](https://digitalcollections.museumofflight.org/files/square_thumbnails/a0871d0f64f80f10b8ac4d88a6c9e0f2.jpg "[Letter and air mail cover addressed to William E. Boeing from W. Irving Glover, Second Assistant Postmaster General, June 3, 1930]")
Letter and air mail cover addressed to William E. Boeing from W. Irving Glover, Second Assistant Postmaster General, June 3, 1930. Congratulates Boeing Air Transport, Inc. on upcoming completion of ten million miles of flight with the Air Mail. One…