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" ... But the book is arguably most valuable in chronicling the early days of NASA’s aeronautics program in the high desert of California, where successor aircraft to the Bell X-1 were now being routinely tested. This includes the X-15, which was intended to become the world’s first spacecraft. The X-15 was not a capsule mounted on a ballistic missile, but rather a rocketplane that would return from Earth orbit and land on a normal runway, as did the U.S. space shuttle. ... "