#SpaceShips

050714 SpacePlanesD 050714 SpacePlanesB 050714 SpacePlanes

http://www.gao.gov/archive/1999/ns99176.pdf

http://www.boeing.com/boeing/defense-space/ic/sis/x37b_otv/x37b_otv.page

http://bigstory.ap.org/content/spacex-dragon-2

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