USDA Forest Service:
1952. Spruce Budworm Control Project publication cover. Oregon State Board of Forestry.
USDA Forest Service:
1952. Spruce Budworm Control Project Plan of Operation publication cover. Oregon State Board of Forestry. Salem, Oregon.
USDA Forest Service:
1950. Plan of Operations, Spruce Budworm Control Program publication cover. Oregon State Board of Forestry. George Spaur State Forester. Salem, Oregon.
USDA Forest Service:
1965. Picking western white pine cones with a ladder. Horse Creek, Wasllowa-Whitman National Forest, Oregon.
USDA Forest Service:
1965. Picking western white pine cones with a ladder. Horse Creek, Wasllowa-Whitman National Forest, Oregon.
USDA Forest Service:
1965. Picking western white pine cones with a ladder. Horse Creek, Wasllowa-Whitman National Forest, Oregon.
USDA Forest Service:
1939. A Brief Review of Forest Insect Problems in the Pacific Northwest. Presented to the Joint Congressional Committee on Forestry. Publication cover.
USDA Forest Service:
1939. A Brief Review of Forest Insect Problems in the Pacific Northwest. Page 1.
USDA Forest Service:
1939. A Brief Review of Forest Insect Problems in the Pacific Northwest. Chart 1: Total annual loss from Pine Beetles in Oregon and Washington 1931 to 1938.
USDA Forest Service:
1939. A Brief Review of Forest Insect Problems in the Pacific Northwest. Chart 2. Average Annual Value of Ponderosa Pine Killed By Beetles in Oregon and Washington 1931-1937.
USDA Forest Service:
1939. A Brief Review of Forest Insect Problems in the Pacific Northwest. Chart 3. Average Annual Growth and Depletion of Ponderosa Pine Eastside Oregon and Washington 1931-1937.
USDA Forest Service:
1939. A Brief Review of Forest Insect Problems in the Pacific Northwest. Page 5.
USDA Forest Service:
1939. A Brief Review of Forest Insect Problems in the Pacific Northwest. Page 6.
USDA Forest Service:
1939. A Brief Review of Forest Insect Problems in the Pacific Northwest. Page 7.
USDA Forest Service:
1939. A Brief Review of Forest Insect Problems in the Pacific Northwest. Page 8.
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. A Brief Review of Forest Insect Problems in the Pacific Northwest. Chart 6. Average Annual Value of Ponderosa Pine Killed by Beetles in Oregon and Washington and Amount Spent for Control and Research 1931-1938.
USDA Forest Service:
1939. A Brief Review of Forest Insect Problems in the Pacific Northwest. Page 11.
USDA Forest Service:
2017. Spray helicopter and chase truck. Asian gypsy moth eradication. Oregon.
USDA Forest Service:
c.1920. A brush pile that has been so piled that it will burn clean when fire is applied to it. Medicine Bow National Forest, Wyoming.
USDA Forest Service:
1965. Timber stand mapping project. Forest Officer transfers stand map information from aerial photos to base map by means of Zeiss Sketchmaster. Pisgah and Nantahala National Forests, North Carolina.
USDA Forest Service:
1946. Aerial photo interpretation technique by Earl J. Rogers. Northeastern Forest Experiment Station, Philadelphia, Pennsylvania.
USDA Forest Service:
1946. View of radial line plotter used in locating sample plots on aerial photos. Northeastern Forest Experiment Station, Philadelphia, Pennsylvania.
USDA Forest Service:
1946. View of radial line plotter used in locating sample plots on aerial photos. Northeastern Forest Experiment Station, Philadelphia, Pennsylvania.
USDA Forest Service:
1975. Alex Shigo (left) testing tree soundness with a shigometer.
USDA Forest Service:
1975. Alex Shigo's shigometer - used to test for tree soundness and decay.
USDA Forest Service:
1975. Alex Shigo looking at decay in a downed tree.
USDA Forest Service:
1975. Alex Shigo (right) explains how the shigometer works to indicate decay in a standing tree.
USDA Forest Service:
1975. Forest pathologist marks a lodgepole pine stump; tree killed by mountain pine beetle. Wood deterioration study.
USDA Forest Service:
1975. Forest pathologists photographing rounds of lodgepole pine killed by mountain pine beetle. Wood deterioration study.
