1966. Charles Sartwell with variable angle-gauge for use in estimating stand density by angle-summation method. Bald Mountain, 15 miles NW of Silver Lake, Lake County, Oregon. (27086053798)

Charles Sartwell with variable angle-gauge for use in estimating stand density by angle-summation method. Bald Mountain, 15 miles NW of Silver Lake, Lake County, Oregon.
Photo by: Ken H. Wright
Date: October 1966
Credit: USDA Forest Service, Pacific Northwest Region, State and Private Forestry, Forest Health Protection.
Source: Portland Station Collection; La Grande, Oregon.
Image: PS-3205
For additional historical forest entomology photos, stories, and resources see the Western Forest Insect Work Conference site: <a href="http://wfiwc.org/content/history-and-resources" wfiwc.org/content/history-and-resources</a>

Image provided by USDA Forest Service, Pacific Northwest Region, State and Private Forestry, Forest Health Protection: <a href="https://www.fs.usda.gov/main/r6/forest-grasslandhealth" www.fs.usda.gov/main/r6/forest-grasslandhealth</a>