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United States Department of Agriculture


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https://www.fs.usda.gov/treesearch/content/pdf?name=Predators%20collected%20from%20balsam%20woolly%20adelgid%20and%20Cooley%20spruce%20gall%20adelgid%20in%20western%20Oregon%20and%20Washington,%20U.S.A.,%20with%20reference%20to%20biological%20control%20of%20hemlock%20woolly%20adelgid%20(Hemiptera:%20Adelgidae)