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A completely revised edition of Williams' previous work with the late Ruth Ashton Nelson. this edition uses simple and clear keys to identify more than 350 species of plants found in the Rocky Mountain region from the United States to Canada.

Produktbeschreibung
A completely revised edition of Williams' previous work with the late Ruth Ashton Nelson. this edition uses simple and clear keys to identify more than 350 species of plants found in the Rocky Mountain region from the United States to Canada.
Autorenporträt
Author of over twenty books, Roger L. Williams is Professor Emeritus of History at the University of Wyoming. He is currently writing a book on the early botanical expeditions of the American West. He lives in Laramie, Wyoming.