Cross section of top end of Log 1, Douglas-fir tree number 23. Douglas-fir deterioration study. Tillamook Burn, Oregon.
Photo by: Illegible (Morr..) Date: September 15, 1937
Credit: USDA Forest Service, Pacific Northwest Region, State and Private Forestry, Forest Health Protection. Collection: Bureau of Entomology, Portland Station Collection; La Grande, Oregon. Image: PS-594
See: Kimmey, J.W. and R.L Furniss, 1943. Deterioration of Fire-Killed Douglas-fir. Technical Bulletin No. 851, USDA Washington, DC. 33p.
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, 1903-1953. Part 2. Oregon and Washington. American Entomologist, 48(3), p. 178-185.