As prior reviews state, the text is well-selected from Powell's journal, and the photographs are superb. But how can the author publish the journal of an explorer without a map keyed to the dates of journal entries? The photographs are superb, but again, not keyed to a map, or even associated with the text. The identifying data for each photo is listed in the front of the book, but is not given on, or near the photograph. A potentially superb book, but, because of these defects and faults, one that is maddening to read.