NASA Armstrong Fact Sheet: X-15 Hypersonic Research Program | NASA
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X-15: The plane that helped create the Space Shuttle - BBC Future
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North American X-15 - Wikipedia
North American X-15A-2 > National Museum of the United States Air Force™ > Display
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North American X-15 Hypersonic Rocket: 16 stunning photos of the X-15 the fastest plane in US history
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North American X-15 - Wikipedia
The X-15 Rocket Plane: Implications for Reusable Booster Schedule & Cost (1966) | WIRED
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THE STORY OF THE X-15 OFFICIAL WORLD RECORD FOR THE HIGHEST SPEED EVER SET BY A MANNED, POWERED AIRCRAFT - The Aviation Geek Club
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North American X-15 Hypersonic Rocket: 16 stunning photos of the X-15 the fastest plane in US history
NASA Armstrong Fact Sheet: X-15 Hypersonic Research Program | NASA
NASA Armstrong Fact Sheet: X-15 Hypersonic Research Program | NASA
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North American X-15A-2 > National Museum of the United States Air Force™ > Display
X-15: The fastest manned rocket plane ever - CNN Style
