NASA's commercial cargo providers : are they ready to supply the space station in the post-shuttle era? : hearing before the Subcommittee on Space and Aeronautics, Committee on Science, Space, and Technology, House of Representatives, One Hundred Twelfth Congress, first session, Thursday, May 26, 2011.
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Washington : U.S. G.P.O. : For sale by the Supt. of Docs., U.S. G.P.O., 2011.