A brief introduction to the workhorse of the early airmail service, the deHavilland DH-4B airplane. Read more at: http://npm.si.edu/exhibits/current/ai... The deHavilland DH-4 Airplane is on display at the National Postal Museum, on loan from the National Air and Space Museum.The deHavilland DH-4 Airplane - YouTube | |
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| Education | Upload TimePublished on 19 Aug 2010 |
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