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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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11 primary books13 released booksBarsoom is a 13-book series with 13 released primary works first released in 1912 with contributions by Edgar Rice Burroughs, Frank Schoonover, and James Allen St. John.
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