William M. Ciesla, Forest Health Management International, Bugwood.org

USDA Forest Service - Region 4 - Intermountain , USDA Forest Service, Bugwood.org

USDA Forest Service - Region 2 - Rocky Mountain Region , USDA Forest Service, Bugwood.org

USDA Forest Service - Region 4 - Intermountain , USDA Forest Service, Bugwood.org

USDA Forest Service - Region 2 - Rocky Mountain Region , USDA Forest Service, Bugwood.org

Donald Owen, California Department of Forestry and Fire Protection, Bugwood.org