The Barsoom Series by Edgar Rice Burroughs

Barsoom is a fictional representation of the planet Mars created by American pulp fiction author Edgar Rice Burroughs. The first Barsoom tale was serialized as Under the Moons of Mars in 1912, and published as a novel as A Princess of Mars in 1917. Ten sequels followed over the next three decades, further extending his vision of Barsoom and adding other characters.
Contents

A Princess of Mars
The Gods of Mars
Warlord of Mars
Thuvia, Maid of Mars
The Chessmen of Mars
The Master Mind of Mars
A Fighting Man of Mars