| 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. |
| 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. |
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