Gerry Doyle on Twitter: "anyway. the j-58 and sr-71/a-12 were real; the sr-72 and xf-103 exist only on paper. but the concept may be crucial to next-gen high-speed flight. and this concludes
AMER 1/144 Scale Lockheed SR-71 Blackbird Aircraft Diecast Model Toy Collection | eBay
A-12 OXCART: The Father of the SR-71 - Military-wiki
SR-71 Blackbird: The Cold War spy plane that's still the world's fastest airplane - CNN Style
Frozen Blackbird
File:SR-71 engines.JPG - Wikimedia Commons
The Story of How America's Mach 3 SR-71 Spy Plane Out Ran Missiles | The National Interest