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Douglas M-4 Mailplane
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[Douglas M-4 Mailplane aircraft]
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Photograph of a Douglas M-4 Mailplane aircraft parked in a field, circa 1920s.
![[Douglas M-4 Mailplane aircraft]](https://digitalcollections.museumofflight.org/files/square_thumbnails/fbb3718bb2b8a61665fc366423b3e0e1.jpg "[Douglas M-4 Mailplane aircraft]")
