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[email protected] Gary Watson Senior Research Scientist The Morton Arboretum Lisle, Illinois, U.S. P. Eric Wiseman Assistant Professor Department of Forestry Virginia Tech 228 Cheatham Hall Blacksburg, Virginia 24061, U.S. J. Roger Harris Professor Department of Horticulture Virginia Tech 301 Saunders Hall Blacksburg, Virginia 24061, U.S. ©2009 International Society of Arboriculture
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