Douglas DC-1, DC-2, DC-3
http://theageofaerospace.co.uk/boeing/watch/ep1/ch5
https://en.wikipedia.org/wiki/Douglas_DC-1
https://en.wikipedia.org/wiki/Douglas_DC-2
https://en.wikipedia.org/wiki/Douglas_DC-3
https://en.wikipedia.org/wiki/Douglas_Aircraft_Company
https://en.wikipedia.org/wiki/Donald_Wills_Douglas,_Sr.
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