Two great books about the LOCKHEED SR-71 Blackbird and the people who built them and flew them. LOCKHEED BLACKBIRD, BEYOND THE SECREC MISSIONS by Paul Crickmore. Plus LOCKHEED'S SR-71 FAMILY, A-12 F-12 M-21 D-21 AND SR-71 by James Goodall and Jay Miller. Both book in very good condition. Fascinating!