National Audubon Society Pocket Guide to Familiar Trees: West 
Paperback – Illustrated, Jan. 12 1987
by National Audubon Society
 
A portable, comprehensive field guide--brimming with concise descriptions and stunning color photographs, and designed to fit into your back pocket--from the go-to reference source for over 18 million nature lovers.

This handy, streamlined field guide identifies the most frequently encountered trees of North America's western region. Packed with information, it includes detailed photographs and diagrams, specific descriptions, and a glossary of terms.