Planetary flagship missions : Mars Rover 2020 and Europa Clipper : hearing before the Subcommittee on Space, Committee on Science, Space, and Technology, House of Representatives, One Hundred Fifteenth Congress, first session, July 18, 2017.
Planetary flagship missions : Mars Rover 2020 and Europa Clipper : hearing before the Subcommittee on Space, Committee on Science, Space, and Technology, House of Representatives, One Hundred Fifteenth Congress, first session, July 18, 2017.