Assume you have read other books on Chaco. Also assume you have been there a few times and have been overwhelmed like so many at the vastness of the site. Assume you need to put it all together in your head. This book helps. It is an A-Z compendium of not only the big ruins, but all of the outlier sites most people don’t trudge around because you need to hike! In clear concise language you have a list of archaeological terms (with background), architectural styles (put into a timeline context), recent and not so recent excavations, relationships to existing native populations (if any), cultural and religious theories (because theory is just what they are). This is a deluxe paperback with lots of illustrations which makes everything easy to find. Subjects are mostly brief—but given enough attention to satisfy the casual reader. I have started taking it with me on trips to Chaco because, it seems, little nitpick questions keep popping up in my mind. But—the book is too cumbersome to hike with. You don’t want to read while you are hiking anyway!