• Science: Environment: Biodiversity: Conservation: Plants: Trees  (3)

• The American Chestnut Foundation - Dedicated to the restoration of the American Chestnut through scientific breeding and cooperative research.
• The Canadian Chestnut Council - Charitable organization to promote the American chestnut: organization and biological news.
• Elm Research Institute - Nonprofit organization dedicated to the restoration of the American elm tree, Ulmus americana. Includes information about Dutch elm disease and the American Liberty elm, a group of cultivars with resistance to this fungal disease.
• Elmcare.com - Devoted to elm trees and elm care with sections dealing with diseases (including Dutch elm disease), new research, tree physiology and other elm-related information.
• Saskatchewan Dutch Elm Disease Association - The SDEDA is an association created to preserve the American Elm in Saskatchewan. Provides information on Dutch Elm Disease and ways to battle the disease.

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