Aspen Restoration in the Western United States-U.S. Forest Service
Ecological Dynamics on Yellowstone's Northern Range - by The National Academy of Science
Bird species found in aspen of northern Yellowstone National Park
Tree of the Month page - for quaking aspen biology and natural history information
Biogeography of Quaking Aspen (Populus tremuloides). San Francisco State University, Department of Geography, GEO 316 Biogeography.
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