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Kellett KD-1 Kellett XR-8 Kellett Autogiro Corporation Kellett XR-10 Kellerton, Iowa Kelle, Tuşba Keller, TexasTài liệu tham khảo
WikiPedia: Kellett Autogiro Corporation http://www.flightglobal.com/pdfarchive/view/1956/1... http://www.flightglobal.com/pdfarchive/view/1958/1...