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First three books of the Barsoom series by Edgar Rice Burroughs.
A Princess of Mars, the first novel in the Barsoom series, with its sequels The Gods of Mars and The Warlord of Mars, form a trilogy centered upon protagonist John Carter and damsel in distress Dejah Thoris. John Carter's and Dejah Thoris's son Carthoris is also introduced as a minor character in The Gods of Mars, as is Thuvia.