Class 3C and 2C. Tree Selection. Keen Ponderosa Pine Tree Classification. Photo by: F.P. Keen Date: September 1934 Credit: USDA Forest Service, Pacific Northwest Region, State and Private Forestry, Forest Health Protection. Collection: Bureau of Entomology and Portland Station Collections; La Grande, Oregon. Image: PS-239 and BUR-8716 To learn more about this photo collection see: Wickman, B.E., Torgersen, T.R. and Furniss, M.M. 2002. Photographic images and history of forest insect...
Topics: divisionofforestinsectinvestigations, r6, usda, stateandprivateforestry, bur8716, foresthealth,...
Class 3C and Class 2C. Tree Selection. Keen Ponderosa Pine Tree Classification. Photo by: F.P. Keen Date: September 1934 Credit: USDA Forest Service, Pacific Northwest Region, State and Private Forestry, Forest Health Protection. Collection: Bureau of Entomology Collection; La Grande, Oregon. Image: BUR-8716 To learn more about this photo collection see: Wickman, B.E., Torgersen, T.R. and Furniss, M.M. 2002. Photographic images and history of forest insect investigations on the Pacific Slope,...
Topics: divisionofforestinsectinvestigations, r6, usda, stateandprivateforestry, treeselection, tree,...
Class 2B and Class 2C (group). Keen Ponderosa Pine Tree Classification. Camp Sherman, Oregon. Photo by: F.P. Keen Date: August 3, 1939 Credit: USDA Forest Service, Pacific Northwest Region, State and Private Forestry, Forest Health Protection. Collection: Bureau of Entomology and Portland Station Collections; La Grande, Oregon. Image: PS-411 and BUR-8881 To learn more about this photo collection see: Wickman, B.E., Torgersen, T.R. and Furniss, M.M. 2002. Photographic images and history of...
Topics: susceptibility, divisionofforestinsectinvestigations, r6, usda, stateandprivateforestry, tree,...
