Lockheed SR-71: The Mach 3 Blackbirdby Paul Crickmore
America's most closely kept top-secret weapon of the cold war. Years after its retirement many technical aspects of this spyplane are still classified. It cruised at an amazing Mach 3 and its flying altitude was nearly 85,000 feet. Its spy photos were critically important during the Cold War and vital during the Gulf War. A great value.
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