This guide probably includes the word "Grand Canyon" in its title to attract sales, but really it is a book about Arizona. I found, although there are indeed many pages devoted to the Grand Canyon, it didn't really tell me anything that I found useful. I would have preferred a book about the Grand Canyon and nothing else, of equal size.
If you're travelling around to other scenic parts of Arizona, this would be a good book for you because it will give you lots of ideas about which places to visit. And the photographs are excellent. But if you only intend to visit the Grand Canyon, keep shopping around, as you will find this book disappointing.