USDA Forest Service:
1931. Wesley Grey and mechanic. Hemlock looper control project. Pacific and Grays Harbor Counties, WA.
USDA Forest Service:
1931. Western hemlock looper control project. Pacific and Grays Harbor Counties, Washington.
USDA Forest Service:
1931. Western hemlock looper control project. Pacific and Grays Harbor Counties, Washington.
USDA Forest Service:
1931. Western hemlock looper control project. Pacific and Grays Harbor Counties, Washington.
USDA Forest Service:
1931. Western hemlock looper control project. Pacific and Grays Harbor Counties, WA.
USDA Forest Service:
1931. Hemlock looper control project. Naselle area, Washington.
USDA Forest Service:
1931. Airplane dusting forest for western hemlock looper control. Pacific and Grays Counties, Washington.
USDA Forest Service:
1931. Airplane dusting forest for western hemlock looper control. Pacific and Grays Counties, Washington.
USDA Forest Service:
1931. Airplane dusting forest for western hemlock looper control. Pacific and Grays Counties, Washington.
USDA Forest Service:
1931. Airplane dusting on Naselle area for forest for western hemlock looper control. Pacific and Grays Counties, Washington.
USDA Forest Service:
1931. Airplane dusting on Naselle area for forest for western hemlock looper control. Pacific and Grays Counties, Washington.
USDA Forest Service:
1931. Two airplanes dusting on Naselle area for forest for western hemlock looper control. Pacific and Grays Counties, Washington.
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:
1945. Demonstration spraying on hemlock looper project, Clatsop County, Oregon.
USDA Forest Service:
1945. Demonstration spraying on hemlock looper project, Clatsop County, Oregon.
USDA Forest Service:
1945. Waco airplane. Hemlock looper control project. Clatsop County, Oregon.
USDA Forest Service:
1945. Waco airplane. Hemlock looper control project. Clatsop County, Oregon.
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. Central Aircraft Waco airplane. Hemlock looper control project. Clatsop County, Oregon.
USDA Forest Service:
1945. Waco airplane. Hemlock looper control project. Clatsop County, Oregon.
USDA Forest Service:
1945. Waco airplane. Hemlock looper control project. Clatsop County, Oregon.
USDA Forest Service:
1945. Servicing airplane. Hemlock looper control project. Clatsop County, Oregon.
USDA Forest Service:
1945. Loading airplane with lead arsenate. Hemlock looper control project. Clatsop County, Oregon.
USDA Forest Service:
1945. Seaside airstrip with drums of fish oil and solvent in the foreground. Western hemlock looper control project. Clatsop County, Oregon.
USDA Forest Service:
1945. Loaded plane - hemlock looper control project. Clatsop County, Oregon.
USDA Forest Service:
1945. Airplane taking off with load of spray. Hemlock looper control project. Clatsop County, Oregon.
USDA Forest Service:
1945. Airplane taking off with load of spray. Hemlock looper control project. Clatsop County, Oregon.
USDA Forest Service:
1945. Airplane taking off with load of spray. Hemlock looper control project. Clatsop County, Oregon.
