Challenges and opportunities in the NASA fiscal year 2011 budget proposal [electronic resource] : hearing before the Subcommittee on Science and Space of the Committee on Commerce, Science, and Transportation, United States Senate, One Hundred Eleventh Congress, second session, February 24, 2010.
Imprint
Washington : U.S. G.P.O. : For sale by the Supt. of Docs., U.S. G.P.O., 2010.