• North Dakota State University: DED Site
• Winnipeg's Coalition to Save the Elms Site
• Elmcare
• Elms Return to Elm Street
• Government of Alberta DED Site
• Saskatchewan Dutch Elm Disease Association
• Global Forest Watch
• Saskatchewan Forestry Association

• Tree Canada
• GreenStreet
• Evergreen
• Ecokids online
• Treetures

The University of Saskatchewan's "Gardenline Online" has some excellent articles concerning trees:

• The Threat of Dutch Elm Disease
• Trap Trees for Dutch Elm Disease