Lockheed A-12 in flight (US Air Force photo)
In wandering down assorted internet rabbit holes, I came across a couple of historically interesting articles about the A-12/SR-71 series of aircraft. The first was from the April, 1964 issue of Air Force Magazine with speculation on the mission and performance of the newly announced A-11. I’m impressed with what the author was able to deduce from unclassified information in 1964.
Another interesting article is from the CIA website. (I’m still conflicted about the CIA having a web site.)
Enjoy!
The Lexicans 
I found these historic photos to be interesting – how the transported the plane from its Burbank birthplace to Groom Lake
http://www.roadrunnersinternationale.com/transporting_the_a-12.html