* Durable, inexpensive, fun to use nature identification guide * Great for families, hikers, and anyone who loves trees * Created by a high-school science teacher This field guide to Northwest trees is easy to stash in the car or slip into your pack. No matter the weather or terrain, Mac's Field Guides are the perfect wildlife identification tool for the amateur naturalist, covering a wide variety of subjects and regions in North America. More than 1 million Mac's Guides have been sold!