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[Carruthers]

Originally Posted by Gravdigr

Still the most awesome-looking thing that's ever flown.

Sinister

I can thoroughly recommend Lockheed Blackbird: Beyond the Secret Missions by Paul Crickmore.
There's plenty of choice on Amazon.com from about $21.
I haven't linked to the page given that availability and pricing tends to vary from one day to the next.

Abebooks.com is also worth a look, but check which edition is on offer.
The latest edition was published in November 2016.

In the meantime, Google 'SR 71 Baltic Express'.