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References
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Bowers, Janice Emily. The Mountains Next Door. Tucson: University of Arizona Press, 1991. Petrides, George A. and Olivia. Western Trees. Boston: Houghton Mifflin Company, 1992. Shaw, Daniel and Mary Stuever. Philmont Fieldguide. Philmont Scout Ranch, Cimarron, New Mexico: Boy Scouts of America, 1985. Trimble, Stephen. The Sagebrush Ocean. Reno, Nevada: University of Nevada Press, 1989. Tweit, Susan J. The Great Southwest Nature Factbook. Portland: Alaska Northwest Books, 1992. U.S. Department of Agriculture. Trees Native to the Forests of Colorado. Durango, Colorado: San Juan Mountains Association, 1999. Wheelwright, Jeff. "2002: The Year of Cloning." Discover, January 2003, pp. 28-31. Zwinger, Ann. Beyond the Aspen Grove. Tucson: University of Arizona Press, 1981. Zwinger, Ann and Barbara Sparks. Aspen: Blazon of the High Country. Salt Lake City: Peregrine Smith Books, 1991. |












