In a November 27th posting on his excellent blog, Civil War Books and Authors, Drew Wagenhoffer highlighted an important bibliography compiled by Gordon Chappell. Maybe (probably) this makes me a geek, but I do enjoy a well done bibliography. It's helpful to see a listing of books and other materials on a topic, and I am often led to previously unknown resources.
Chappell's The Civil War in the American West Bibliography is an extensive listing of books, monographs, and pamphlets. Helpfully, the compiler also includes comments about many of the works. Check it out--I bet you'll find some surprises!