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.
   http://www.libertyelm.com/

The Canadian Chestnut Council  
   Charitable organization to promote the American chestnut: organization and biological news.
   http://www.uoguelph.ca/~chestnut

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.
   http://www.elmcare.com

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.
   http://www.sdeda.ca/

The American Chestnut Foundation  
   Dedicated to the restoration of the American Chestnut through scientific breeding and cooperative research.
   http://www.acf.org/