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Fraser Fir and Balsam Wooly Aphid: Summary of Information. The Southern Appalachian Research -- Resource Management Cooperative, 1980.
Fraser Fir in the Great Smoky Mountains National Park: Its Demise by the Balsam Woolly Aphid (Adelges Piceae Ratz.). Knoxville, TN: Department of Forestry, University of Tennessee, 1978.
