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Köln: ITE, 2008
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International Society of Arboriculture, 2009
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American Society for Horticultural Science, 1992
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American Society for Horticultural Science, 2009
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American Society for Horticultural Science, 2009
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American Society for Horticultural Science, 2005
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American Society for Horticultural Science, 2009
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American Society for Horticultural Science, 2009
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American Society for Horticultural Science, 2006
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Horticultural Research Institute, 2001
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American Society for Horticultural Science, 1995