Dave Powell, USDA Forest Service (retired), Bugwood.org

Dave Powell, USDA Forest Service (retired), Bugwood.org

Minnesota Department of Natural Resources - FIA , Minnesota Department of Natural Resources, Bugwood.org

Minnesota Department of Natural Resources - FIA , Minnesota Department of Natural Resources, Bugwood.org

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

USDA Forest Service - Northern and Intermountain Region , USDA Forest Service, Bugwood.org