USDA Forest Service:
c.1932. Drawing by W.D. Edmonston shows seasonal history of Dendroctonus pseudotsugae Hopk.
USDA Forest Service:
c.1934. Drawing shows some western bark beetles injurious to native and planted trees used for ornamental and recreational purposes.
USDA Forest Service:
1934. Drawing shows the brood stages, work and life history of the Douglas-fir beetle. Dendroctonus pseudotsugae Hopk. by artist de Young.
USDA Forest Service:
1939. A Brief Review of Forest Insect Problems in the Pacific Northwest. Page 8. Figure 3. Map of Major Projects 1938-1939. Forest Insect Laboratory, Portland, Oregon.
USDA Forest Service:
1942. Drawing by K. Flaherty shows the seasonal activity of Douglas-fir beetle.
USDA Forest Service:
1942. Douglas-fir beetle. Coleoptera. Scolytidae. Dendroctonus pseudotsugae Hopk.
USDA Forest Service:
1952. Typical Douglas-fir blowdown that gave rise to the Douglas-fir beetle outbreak. Millicoma Forest (Weyerhaeuser Company). Coos County, Oregon.
USDA Forest Service:
1952. Tree mortality caused by Douglas-fir beetle in the Mary's Peak Watershed, west of Corvallis, Oregon.
USDA Forest Service:
1952. East face of Mary's Peak. Light trees were beetle killed. The beetles bred in 1949-1950 blowdown. Benton County, OR.
USDA Forest Service:
1952. Douglas-fir killed by bark beetles in 1951. NE face of Mary's Peak. Corvallis watershed. Benton County, OR.
USDA Forest Service:
1952. Douglas-fir killed by bark beetles in 1951. Beetles bred in blowdown of 1949-1950. East face of Mary's Peak. Benton County, OR.
USDA Forest Service:
1952. Most of the aerial personnel and overhead on the 1952 Blowdown and Bark Beetle Survey. Oregon.
USDA Forest Service:
1952. List of names on the back of the group shot of "most of the aerial personnel and overhead" on the 1952 Blowdown and Bark Beetle Survey.
USDA Forest Service:
1952. Bob Stevens and John Lanz on the left. 1952 Blowdown and Bark Beetle Survey. Oregon.
USDA Forest Service:
1952. Cessna 170B survey plane, N22130. 1952 Blowdown and Bark Beetle Survey, Oregon.
USDA Forest Service:
1952. L-R: Peter Orr, R.B. Pope, Ken Wright with Cessna 170B. Blowdown Bark Beetle Survey. Oregon.
USDA Forest Service:
1952. Cessna 170B. 1952 Blowdown and Bark Beetle Survey. Oregon.
USDA Forest Service:
1952. "Flight Baker". L-R: W. Merrick (aerial observer); W.G. Hubbard (aerial observer); C.S. Davis (pilot); M.E. Barber (aerial observer). 1952 Blowdown and Bark Beetle Survey. OR.
USDA Forest Service:
1952. Flight crew, left-to-right: Dave Robinson, Bob Stevens, John Lanz, and unidentified. 1952 Blowdown and Bark Beetle Survey, Oregon.
USDA Forest Service:
1952. A mapping crew putting on parachutes, preparing to survey. Peter W. Orr and Morrie Barber on the left. 1952 Blowdown and Bark Beetle Survey, Oregon.
USDA Forest Service:
1952. Bureau of Entomology and Plant Quarantine Cessna 170-B survey plane on reconnaissance survey over the Willamette National Forest. Douglas-fir bark beetle blowdown survey.
USDA Forest Service:
1952. Crew loading up for takeoff on Blowdown and Bark Beetle Survey. Project was completed in six weeks' time using four air crews of four men each to observe blowdown and bark beetle damage. Eugene, Oregon.
USDA Forest Service:
1952. Cessna 170-B survey plane mapping Douglas-fir beetle damage near Sutherlin, Oregon.
USDA Forest Service:
1952. Bureau of Entomology and Plant Quarantine (BEPQ) Cessna 170-B with pilot John F. Wear on reconnaissance survey. Douglas-fir beetle/blowdown survey. Willamette National Forest, Oregon.
USDA Forest Service:
1952. Blowdown and bark beetle aerial survey crews preparing to take off. Eugene, OR.
USDA Forest Service:
1952. Aerial crews preparing maps and equipment in ready-room before starting the day's run. 1952 Blowdown and Bark Beetle Survey. Eugene, Oregon.
USDA Forest Service:
1952. Map 1. Area mapped 100% blowdown and beetle-killed timber. Area mapped 100% beetle-killed timber and 12.5% for blowdown.
USDA Forest Service:
1952. Map 2. Intensity of Blowdown in Areas Covered by The Survey. Classification is based on approximate number of acres per square mile on which 10% or more of the stand is recent blowdown. The data is generalized for min. areas of about 3,500 acres.
USDA Forest Service:
1952. Map 3. Intensity of tree-killing by the Douglas-fir bark beetle in western Oregon and southern Washington in 1951. Volume in gross board feet Scribner. The data have been generalized for minimum areas of about 1,000 acres from 1"-per-mile scale maps
USDA Forest Service:
1952. Map 4. Location of Ground Plots for Sampling Blowdown. Blowdown-BarkBeetle Survey.
