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get [PDF] Download Douglas D-558: D-558-1 Skystreak and D-558-2 Skyrocket (X-Planes) | This title is a detailed, illustrated guide to the Douglas D-558, the ground-breaking US Navy research aircraft which became the first aircraft to break Mach 2, and paved the way for America's Cold War ?Century Series? fighters.The six Douglas D-558 research aircraft, built as two variants, were produced for a US Navy and NACA col