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Hiller X-18 Tham khảoThực đơn
Hiller X-18 Tham khảoLiên quan
Hiller OH-23 Raven Hillerød Hiller X-18 Hiller YH-32 Hornet Hillersleben Hillerse Hillary Clinton Hillel Furstenberg Hillebrandia sandwicensis HillegomTài liệu tham khảo
WikiPedia: Hiller X-18 http://www.things-with-wings.com/VTOL/Hiller.htm http://www.tiltrotormech.com/aircraftpages/hiller_... http://www.studenten.net/customasp/axl/plane.asp?c... https://web.archive.org/web/20050116120216/http://... https://commons.wikimedia.org/wiki/Category:Hiller...