Lost Race of Mars
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Are the Old Martians really a lost race—just withered mummies lying in dark caves? Or are they still alive—somewhere on the red planet? Sally and Jim must find out. They must help their father discover if the Old Martians still exist. His life work as a scientist is at stake! But it's not easy. They are only visitors to the Mars colony in this year 2017. And no one really wants them there.
