Guide to identifying native (and some widely introduced) trees of U.S. and Canada east of the Rocky Mountains. Organized as a dichotomous key, the book leads the user through a series of simple questions about the shape or appearance of different parts of a tree. Includes 161 species. Illustrated with line drawings. The small (6" by 4") format fits in pocket or pack to take along on a hike. Author: Watts May Theilgaard.