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Cook, Edward R.. A Tree Ring Analysis of Red Spruce in the Southern Appalachian Mountains In Analyses of Great Smoky Mountain Red Spruce Tree Ring Data. New Orleans, LA: U.S. Department of Agriculture, Forest Service, 1988.

McLaughlin, Samuel B., D. J. Downing, T. J. Blasing, Edward R. Cook, and Harold S. Adams. "An Analysis of Climate and Competition as Contributors to Decline of Red Spruce in High Elevation Appalachian Forests of the Eastern United States." Oecologia 72, no. 4 (1987): 487-501.