A Princess of Mars by Edgar Rice Burroughs [Barsoom #1]

This Halcyon Classics ebook is the first in Edgar Rice Burroughs BARSOOM series.

Forty-three million miles from the earth--a succession of the weirdest and most astounding adventures in fiction. John Carter, American, finds himself on the planet Mars, battling for a beautiful woman, with the Green Men of Mars, terrible creatures fifteen feet high, mounted on horses like dragons.