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WikiPedia: Cornelius XBG-3 //www.amazon.com/dp/B000RMJ7FU //www.amazon.com/dp/B001SLTA1U http://books.google.com/books?id=-YrfAAAAMAAJ&q=Co... http://www.joebaugher.com/usaf_serials/1942_2a.htm... http://www.designation-systems.net/dusrm/app1/bg.h...