From publisher blurb:
The Mechanized Men of Mars is an adventure for Warriors of the Red Planet, a roleplaying game in the tradition of classic style RPG's, also known as original edition, OSR, or retro-clones. Warriors of the Red Planet captures the "Sword and Planet" genre of science fantasy romance, inspired by the works of Burroughs, Vance, Moorcock, Kline, and other novels, movies, and comic books where an earthman goes to another planet and discovers he has unique abilities. There are strange creatures, weird science, power hungry warlords and of course beautiful space princesses.
This adventure takes place on Barsoom, the alien world described in the genre defining book A Princess of Mars by Edgar Rice Burroughs. But, it has been written in a way that it can easily fit into any science-fantasy world that combines lasers and swords.