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    Planetary protection for Mars sample return

    Gershman, R. / Adams, M. / Mattingly, R. et al. | Elsevier | 2003

      Planetary protection for Mars sample return

      Gershman, R. | Online Contents | 2004

    Concepts for a Titan Organics Explorer

    Gershman, R. | NTRS | 2000

    Europa Lander Concepts

    Gershman, R. | NTRS | 1999