Reauthorizing the vision for space exploration [electronic resource] : hearing before the Subcommittee on Space, Aeronautics, and Related Sciences of the Committee on Commerce, Science, and Transportation, United States Senate, One Hundred Tenth Congress, second session, May 7, 2008.
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Washington : U.S. G.P.O. : For sale by the Supt. of Docs., U.S. G.P.O., 2012.