I just finished reading Thuvia of Mars - it was fourth book about adventures on Barsoom - or Mars for us, earthborn.
Written by Edgar Rice Burroughs, Barsoom Series contains 11 books and two stories. First one was published in 1912. And it’s a protoplast of modern space opera genre. 
It tells a story of John Carter, a former captain of Confederates of American Civil war, who suddenly finds himself on surface of dying Mars.
It’s a must read in my opinion for every SF geek.
And - you can get it from Project Guttenberg (just scroll down to Burroughs, Edgar Rice).
Also you can visit John Carter of Mars website.

I just finished reading Thuvia of Mars - it was fourth book about adventures on Barsoom - or Mars for us, earthborn.

Written by Edgar Rice Burroughs, Barsoom Series contains 11 books and two stories. First one was published in 1912. And it’s a protoplast of modern space opera genre. 

It tells a story of John Carter, a former captain of Confederates of American Civil war, who suddenly finds himself on surface of dying Mars.

It’s a must read in my opinion for every SF geek.

And - you can get it from Project Guttenberg (just scroll down to Burroughs, Edgar Rice).

Also you can visit John Carter of Mars website.