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    The hunt for life on Mars by Goldsmith, Donald

    Published 1997
    Book
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    Life in the Universe by Bennett, Jeffrey O.

    Published 2003
    Book
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    Life in the universe by Bennett, Jeffrey, Shostak, G. Seth

    Published 2007
    Book
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    Extraterrestrial intelligence by Heidmann, Jean

    Published 1995
    Book
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