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WikiPedia: Boeing_X-40 http://www.boeing.com/news/releases/1998/news_rele... http://www.dfrc.nasa.gov/gallery/Photo/X-40A/index... http://www.designation-systems.net/dusrm/app4/x-37... http://fas.org/spp/military/program/launch/msp.htm http://www.globalsecurity.org/space/systems/x-40.h...