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5. From here to Mars : hearing before the Subcommittee on Science and Space of the Committee on Commerce, Science, and Transportation, United States Senate, One Hundred Thirteenth Congress, second session, April 9, 2014

6. From here to Mars : hearing before the Subcommittee on Science and Space of the Committee on Commerce, Science, and Transportation, United States Senate, One Hundred Thirteenth Congress, second session, April 9, 2014