Rocky Mountain Tree Finder. by Tom Watts. Key to identifying native trees of the Rockies and the Great Basin, in the U.S. and Canada, by their leaves and needles. Area covered ranges from the dry, hot slopes of the upper Sonoran Zone or Plains Zone, with annual rainfall of 10-20 inches, up to the cold, snowy heights of the Subalpine Zone in the Rockies. (Below about 4,500 feet in Arizona and New Mexico, use the Desert Tree Finder, listed below). Shows habitat, range, life zones. ISBN: 0-912550-05-8. 64 pages. #NASG0986 paper$3.95

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