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== References == | == References == | ||
* [http://www. | * [http://www.rook.org/earl/bwca/nature/trees/populustrem.html Populus tremuloides- Quaking Aspen] Earl J.S. Rook. Valley Internet Company. | ||
* [http:// | * [http://extension.usu.edu/range/Woody/quakingaspen.htm Quaking Aspen] Mindy Pratt et al. Utah State University. | ||
* [http://www. | * [http://bss.sfsu.edu/geog/bholzman/courses/Fall99Projects/aspen.htm Biography of Quaking Aspen (Populus tremuloides)] Douglas W. Johnson. San Francisco State University- Department of Geography. | ||
* [http://www.northern.edu/natsource/TREESA1/Quacki1.htm Quaking Aspen (Populus tremuloides)] South Dakota Department of Agriculuture- Division of Forestry. | |||
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