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Managing Hemlock Woolly Adelgid and Balsam Woolly Adelgid at Great Smoky Mountains National Park." In Third Symposium on Hemlock Woolly Adelgid in the Eastern United States, 232. Asheville, NC: U.S. Forest Service, 2005.
"Memorandum from Kristine Johnson a on the Butternut Disease Monitoring Project to Keith Langdon., 1990.
Balsam Woolly Aphid Infestation of Fraser Fir in the Great Smoky Mountains. Knoxville, TN: University of Tennessee, 1977.
Fraser Fir and Balsam Wooly Aphid: Summary of Information. The Southern Appalachian Research -- Resource Management Cooperative, 1980.
Hemlock Resources at Risk in the Great Smoky Mountains National Park In Proceedings of the Symposium on Sustainable Management of Hemlock Ecosystems in Eastern North America. Newtown Square, PA: U.S. Department of Agriculture, 1999.