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Boeing X-40 - Wikipedia
Boeing X-40A - National Museum of the USAF
The Boeing X-40 Was Decades Ahead of Its Time
X-40A Space Maneuvering Vehicle - NASA
X-40A: Experimental Space Plane That Helped Create the X-37B
NASA Dryden X-40A SMV Photo Collection
X-40A Space Maneuver Vehicle - NASA
X-40 - astronautix.com
X-40A First Free Flight - YouTube
Boeing X-40 Space Maneuver Vehicle - Technology Demonstrators