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• American Society of Consulting Arborists

  Advances the arboricultural consulting profession by promoting public awareness and enhancing the knowledge, skills, and practice of its members. Consulting arborists serve a variety of needs for lawyers, insurance companies, developers, planners, and landscape architects, municipalities, and homeowners.

• International Society of Arboriculture

  To promote and improve the care and preservation of shade and ornamental trees through research and education. Offers a guide on the valuation of trees.

• International Society of Arboriculture - Hispanic Page

  La Sociedad Internacional de Arboricultura (ISA, por sus siglas en inglés) es una organización sin fines de lucro cuya misión es promover la práctica profesional de la arboricultura mediante la investigación, tecnología y educación, y fomentar una mayor conciencia pública acerca de los beneficios de los árboles.

• ISA Certified Arborist List

  This is the International Society of Arboriculture's list of certified arborists.

• Nebraska Arborists Association

  Provides useful information for professional arborists and the public about proper tree care. Features a database of arborists in Nebraska.

• Tree Care Industry Association

  Established in 1938 as the National Arborist Association, today's TCIA develops safety and education programs, standards of tree care practice, and management information for arboriculture firms around the world.