The X-15 hypersonic research aircraft flew 199 missions and gathered valuable data to help future generations of high-speed aircraft.
NASA aeronautics research has kicked off an ongoing project to format archived and government-published books that can be read on digital devices.
"NASA's contributions to aviation affect everyone who has ever stepped foot inside an airplane. Now anyone can read about this historic aeronautical research with the convenience of a hand-held device," said Jaiwon Shin, associate administrator for NASA's Aeronautics Research Mission Directorate.
