SR-71 Blackbird: The Cold War spy plane that's still the world's fastest airplane - CNN Style
A-12 Oxcart vs SR-71 Blackbird | MiGFlug.com Blog
A-12 Blackbird: Hiding OXCART in Plain Sight
The OXCART Family - A-12, YF-12, SR-71, and M21 Blackbirds
Where Are They Now: YF-12 #06935 | NASA
Blackbird Vs Oxcart: the story of project Nice Girl, the recon fly off between the SR-71 and the A-12 and why the Blackbird was chosen over the Oxcart - The Aviation Geek