How Many Barsoomian Mars RPG's Are There?
Fans of Edgar Rice Burrough's classic Mars novels (barely novella length by today's standards) have it good these days with several high quality fan made and official Barsoom inspired RPG's. This wasn't so until somewhat recently.
Before Warriors of the Red Planet the only Burrough's RPG material was few and far between, there was the ill-fated Warriors of Mars by TSR that was quickly squashed by the Burrough's estate. Which wasn't really an RPG, it was a miniatures war game. There were a few other wargames with some RPGish elements like John Carter Warlord of Mars and John Carter Warlord of Mars ... yeah, really and they came out a year apart. But the influence of ERB and his incredible imagination could be felt all across the world of tabletop gaming.
Recently Polyhdral Nonsense compiled a good list of current Barsoomian RPGs with some addendum by commentators here:
btw. While looking up the links for this post I stumbled across my old review of the Disney John Carter movie, which I gave pretty positive marks. I stand by that review, especially when compared to what they've done with Star Wars since then.