Down the Great Unknown: John Wesley Powell's 1869 Journey of Discovery and Tragedy Through the Grand Canyon - Edward Dolnick An enjoyable read, simultaneously gripping and informative. I picked up Down the Great Unknown after reading another of Dolnick's books (The Clockwork Universe) that I enjoyed immensely, and while this isn't quite in the same league as that one, it's still worth looking into. Dolnick's style isn't as dense as many nonfiction writers, so this is an easy read but doesn't skimp on the details, and even his tendency to put in anecdotes surrounding this period is entertaining. (Granted they are occasionally a little too much.)

Perfect for the reader with a casual interest in the Westward expansion, exploration, or the time period in general. Likely not so intriguing for those with a deeper familiarity with the same.