USDA Forest Service:
1920. Scouting and mapping areas of beetle kill from a high point. Jenny Creek, Oregon.
USDA Forest Service:
c.1926. Scouting an Infested Area. From a lookout point, the spotter counts fading, sorrel, and red trees and notes their location on a map. Western pine beetle Infestation in Blue Canyon, Sierra National Forest, California.
USDA Forest Service:
1935. Page 19. BarkBeetle Enemies of California Forests. Prepared by the USDA Bureau of Entomology and Plant Quarantine in cooperation with the State Emergency Relief Administration - Project 3F-2-302 and the Emergency Educational Program. Berkeley, CA.
USDA Forest Service:
1927. Western pine beetle damage. Brown's Well plot. T44N, R8E, Sec 30. 2,000' elevation. Modoc National Forest, California.
USDA Forest Service:
1927. Western pine beetle damage. Airplane view (vertical) of Badger Well plot. Elevation 2,000 feet. Control project. Modoc National Forest, California.
USDA Forest Service:
1927. Western pine beetle damage. Airplane view (vertical) of Timber Mt. plot. Elevation 2,000 feet. Control project. Modoc National Forest, California.
USDA Forest Service:
c.1927. How Bug Infested Trees Look From an Airplane. Flying about 1,200 feet above this open forest of mature ponderosa pine, the observer photographed a new and active infestation of the western pine beetle. Modoc National Forest, California.
USDA Forest Service:
1935. Page 9. BarkBeetle Enemies of California Forests. Prepared by the USDA Bureau of Entomology and Plant Quarantine in cooperation with the State Emergency Relief Administration - Project 3F-2-302 and the Emergency Educational Program. Berkeley, CA.
USDA Forest Service:
1932. Autogyro at Summit Meadows. Mt. Hood National Forest, Oregon.
USDA Forest Service:
1932. Autogyro at Summit Meadows. Mt. Hood National Forest, Oregon.
USDA Forest Service:
1934. The Bureau of Entomology and the Bureau of Plant Quarantine are consolidated with the disease control and eradication functions of the Bureau of Plant Industry to create the Bureau of Entomology and Plant Quarantine (BEPQ).
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:
1939. Extended parachute canopy showing details of design. Okanogan National Forest, Washington.
USDA Forest Service:
1941. Frank Derry, Parachute Instructor-Rigger, instructing prospective smoke jumper in the use of the "drop rig". Simulates landing from chute caught in a snag or other obstacles by use of landing rope. Lolo National Forest, Montana.
USDA Forest Service:
1941. Frank Derry instructs smokejumpers on the use of the 'drop rig'. Lolo National Forest, Montana.
USDA Forest Service:
1941. Smoke jumper wearing complete uniform except gloves, training on the "let-down rig". Lolo National Forest, Montana.
USDA Forest Service:
1942. Figure 1. Fairchild vertical view finder. A - side view; B - top view showing ground glass screen. (From bagley - Aerophotography and Aerosurveying. McGraw Hill Book Co., 1941)
USDA Forest Service:
1942. Figure 2. An illustration of what can be done with panchromatic film and a red filter to show red trees in a heavily infested stand.
USDA Forest Service:
1942. Figure 3A. Comparison of aerial photographs of different scales. Conventional photograph, scale 1:10,000.
USDA Forest Service:
1942. Figure 3B. Comparison of aerial photographs of different scales. Type of photograph necessary for forest insect survey work, scale 1:2,500.
USDA Forest Service:
1945. Parachute and aircraft escape safety training. Practice in escape training procedures. Lolo National Forest, Montana.
USDA Forest Service:
1945. Twenty-eight foot slotted canopy, bottom view opened in the wind to show size and location of Derry slots. Lolo National Forest, Montana.
USDA Forest Service:
1947. Hemlock forest killed by 1929-1932 western hemlock looper outbreak in Pacific County, Washington.
USDA Forest Service:
1947. Hemlock forest killed by 1929-1932 western hemlock looper outbreak in Pacific County, Washington.
USDA Forest Service:
1947. Hemlock spot-killed by western hemlock looper in the 1945-1946 outbreak. Pacific County, Washington.
USDA Forest Service:
1947. Spot kill from 1945-46 western hemlock looper (Lambdina fiscellaria) outbreak. Pacific County, Washington.
USDA Forest Service:
1947. Spot kill from 1945-46 western hemlock looper (Lambdina fiscellaria) outbreak. Pacific County, Washington.
USDA Forest Service:
1947. Original 1947 aerial survey reporting map of the Blue Mountain region showing areas of western spruce budworm (BS) and Douglas-fir tussock moth (TM) defoliation.
USDA Forest Service:
1947. Original 1947 aerial survey map of the Whitman National Forest showing areas of western spruce budworm (BS) defoliation.
USDA Forest Service:
1948. N3N-3 airplane used in the Pacific Northwest for first aerial detection surveys and photo flights in 1947. Pilot John F. Wear (back) and Hessig. Lower wing blocking forward and down visuals made surveying from this aircraft challenging. Portland, OR
