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WikiPedia: Kreider-Reisner XC-31 http://acepilots.com/airplanes/country/american/fa... http://books.google.com/books?id=shwtKbTbEuEC&pg=P... http://www.nationalmuseum.af.mil/factsheets/factsh... https://web.archive.org/web/20100116080945/http://... https://web.archive.org/web/20130927103418/http://...