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11. Next step to Mars : deep space habitats : hearing before the Subcommittee on Space, Committee on Science, Space, and Technology, House of Representatives, One Hundred Fourteenth Congress, second session, May 18, 2016

13. Next steps in human exploration to Mars and beyond : hearing before the Subcommittee on Space, Committee on Science, Space, and Technology, House of Representatives, One Hundred Thirteenth Congress, first session, Tuesday, May 21, 2013

15. NOVA. Looking for life on Mars