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1983. White pine blister rust index calculation in the field.

White pine blister rust index calculation in the field.

 

Photo by: Unknown

Date: 1983

 

Credit: USDA Forest Service, Region 6, State and Private Forestry, Forest Health Protection.

Collection: FHP slide collection; Regional Office, Portland, Oregon.

 

Image provided by USDA Forest Service, Pacific Northwest Region, State and Private Forestry, Forest Health Protection: www.fs.usda.gov/main/r6/forest-grasslandhealth

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Uploaded on February 16, 2017
Taken sometime in 1983