The name Peterson should NOT even be on this guide!! I have many older Peterson guides and have always found referenced any critter of any type I needed to look up. BUT this one was a waste of my money - if I had not damaged the spine opening it when I first received it to look up info I would have returned it. NONE of the 3 snakes that I have seen in areas near Atlanta several times were referrenced! So for me, it was a total waste of money. I found much more info for free on the University of Georgia website. But I like having field guides for when we are outdoors without a computer. This is NOT the one to buy, however. Also, I do not like how it is organized, either - info on a species of snake might require you to look in several different places for info/photo. :(