This was the seventh book I finished in 2012, but the first actual brick-and-mortar book. (Well, not actual brick-and-mortar, but you know what I mean. I really love my Kindle.)
I bought it at the Grand Canyon gift shop, choosing it over a book by the same author listing all the people that have died in the Grand Canyon, including how it happened. That turned out to be a lucky break, since my brother already had that one. Let's just say I'm glad I read it after we stood on the canyon rim.
This book, though, combines the journeys and letters of several of the men who took part in John Wesley Powell's expedition down the Green and Colorado Rivers. They started in Wyoming and finished in Baja California. This was a group of 10 (down to six by the end) Civil War veterans who weren't particularly well trained for this, weren't using suitable boats and didn't get along all that well. Fascinating book, and I'd love to travel along the Colorado some day, but not on that trip with those guys.