Investigations of Balsam Woolly Aphid-Fraser Fir Interaction: Feeding Site Characteristics and Wound Response. Knoxville, TN: The University of Tennessee, 1985.
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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.
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