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Has any artwork of McDonnell's proposed successor to the SR-71, the Isinglass, ever been made public?  During the "Blackstar" brouhaha, Dwayne Day claimed that he was working on a historical article about the Isinglass program.  It appears that he's run into a brick wall of classification.  If that's the case, I'll keep on waiting patiently and eagerly until the classification is dropped on this exciting program.