How many book's are in the Cowboy's And Alien's franchise?

I want to read it before the movie comes out and I only saw one issue at Barns and Noble, I just wanted to make sure on how many there are. Thanks.How many book's are in the Cowboy's And Alien's franchise?
There are two versions of the book out.



This one 1st published in 2006 and reprinted through 2008:



Writers: Fred Van Lente %26amp; Andrew Foley

Pencils: Luciano Lima

Inks: Luciano Karsm J. Wilson, Silvio Spotti

Color: Andrew Elder

The Old West: Settlers and Native Americans wage a bloody battle for control of the land. But when the Earth is threatened by conquerors from the stars, these sworn enemies must work together to save all humanity.



112 pgs, FC,





That seems to be out of print and there's a new version out in Hard Cover (soft cover in May):



(W) Scott Mitchell Rosenberg (a) Luciano Lima

The ultimate showdown between Cowboys and Indians is interrupted - by an alien invasion! - and the Old West will never be the same! Every conqueror believes himself moved by a higher power, his destructive actions justified by necessity, compassion, or divine providence. In the greatest and most deadly expansion the world has seen, European settlers pushed west decimating the native population, without a second thought. But when extraterrestrial invaders land in the Old West, they give the cowboys the fight of their lives, forcing them to pair with Indians in this battle for control of the planet.



112 pgs, FC.



Since you saw it B %26amp; N, Im assuming its the second version that you saw. That's it for the property.