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Affilations
http://www.treecareindustry.org - TCIA develops safety and education programs, standards of tree care practice, and management information for arboriculture
firms around the world.
http://www.isa-arbor.com/ - The International Society of Arboriculture (ISA) has served the tree care industry for over eighty years as a scientific and educational organization. St. Louis Arborists Association
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