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NASA - [Aerospace History 25] - Mach 3 , YF-12 Flight Research, 1969-1979
![NASA - [Aerospace History 25] - Mach 3 , YF-12 Flight Research, 1969-1979](https://img.pdfslide.us/doc/345x265/577ce3131a28abf1038b468d/nasa-aerospace-history-25-mach-3-yf-12-flight-research-1969-1979.jpg)