Published Atlas Page for quaking aspen
Iverson, L. R., A. M. Prasad, B. J. Hale, and E. K. Sutherland. 1999.
An atlas of current and potential future distributions of common trees of
the eastern United States. General Technical Report NE-265. Northeastern
Research Station, USDA Forest Service. 245 pp.
(Contact Anantha Prasad for a copy)
Click on Geographic Predictors Map's Legend to
get an Explanation of the Legend (Regression Tree Diagram)