USDA Forest Service:
1921. Portion of the forest untouched by storm of January 29, 1921. Olympic National Forest, Washington.
USDA Forest Service:
1921. Olympic National Forest blowdown showing portion of the wind thrown timber. Olympic National Forest, Washington.
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:
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:
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. Brown's Well plot. T44N, R8E, Sec 30. 2,000' elevation. Modoc National Forest, California.
USDA Forest Service:
1927. Aerial view of ponderosa pine. Modoc National Forest, California.
USDA Forest Service:
1927. Oblique view of Glass Mountain unit, looking NE. 2,000' elevation. Control project. Modoc National Forest, California.
USDA Forest Service:
1931. Scene on Naselle showing areas infested with western hemlock looper. Washington.
USDA Forest Service:
1931. Aerial scene on Naselle showing areas infested with western hemlock looper. Washington.
USDA Forest Service:
1934. Aerial photo mission. Mt. Hood and Willamette National Forests, Oregon.
USDA Forest Service:
1934. From inside the plane, looking toward the pilot at about 8,000 feet elevation, over the Willamette National Forest. Lage Wernstedt (photographer, right) and Ranger Smith Taylor in the middle.
USDA Forest Service:
1934. Ranger Smith Taylor (left) and aerial photographer Lage Wernstedt. Oregon.
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. Aerial view showing distant view of Seaside airstrip. Hemlock looper control project. Clatsop County, Oregon.
USDA Forest Service:
1945. Aerial view of Seaside airstrip. Hemlock looper control project. Clatsop County, Oregon.
USDA Forest Service:
1945. Seaside and Tillamook Head. Hemlock looper control project. Clatsop County, Oregon.
USDA Forest Service:
1945. Aerial view of the western hemlock looper control project area. Clatsop County, Oregon.
USDA Forest Service:
1945. Airplane spraying insecticide. Western hemlock looper control project. Clatsop County, Oregon.
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:
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.
