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WikiPedia: Boeing_XB-15 http://www.boeing.com/history/boeing/xb15.html http://www.boeing.com/history/chronology/chron04.h... http://books.google.com/books?id=R7GjzzNMpu4C&pg=P... http://books.google.com/books?id=d5MF75MCBHYC&pg=P... http://www.nationalmuseum.af.mil/factsheets/factsh... http://home.att.net/~jbaugher2/b15.html https://web.archive.org/web/20051227032522/http://...