Synthetic Men Of Mars (1969)

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38287362-The_Synthetic_Men_of_Mars,_Ballentine_Books,_1963
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John Carter desperately needed the aid of Barsoom’s greatest scientist. But Ras Thavas was the prisoner of a nightmare army of his own creation — half-humans who lived only for conquest. And in their hidden laboratory seethed a horror that could engulf all of Mars.

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