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WikiPedia: Boeing 307 http://www.aviation-history.com/boeing/307.html http://www.boeing.com/history/boeing/stratoliner.h... http://books.google.com/books?id=vdkDAAAAMBAJ&pg=P... http://www.youtube.com/user/Bomberguy http://www.youtube.com/watch?v=omZSyCFWejI https://commons.wikimedia.org/wiki/Category:Boeing...