National Audubon Society Field Guide to North American Trees: Western Region By Elbert L. Little The most comprehensive field guide available to the trees of North America’s western region–a must-have for any enthusiast’s day pack or home library–from the go-to reference source for over 18 million nature lovers. Nearly 700 species of trees are detailed in beautiful, full-color photographs of leaf shape, bark, flowers, fruit, and fall leaves, and accompanied by informative text. Both compact and comprehensive, and featuring a durable vinyl binding, this is the ideal field companion for beginner and advanced tree-peepers alike. Note: the Eastern Edition generally covers states east of the Rocky Mountains, while the Western Edition covers the Rocky Mountain range and all the states to the west of it. ISBN 10: 0394507614 ISBN 13: 9780394507613