Crater Lake from near Kerr Notch. Crater Lake National Park, Oregon.
Photo by: F. Paul Keen Date: c.1922
Credit: USDA Forest Service, Pacific Northwest Region, State and Private Forestry, Forest Health Protection. Collection: Bureau of Entomology, F. Paul Keen Collection; La Grande, Oregon. Image: FPK-96
For additional information see: www.fs.fed.us/pnw/pubs/pnw_gtr259.pdf Wickman, Boyd E. 1990. The battle against bark beetles in Crater Lake National Park: 1925-34. Gen. Tech. Rep. PNW-GTR-259. Portland, OR: USDA, Forest Service, Pacific Northwest Research Station. 40 p.