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United States Department of Agriculture


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https://www.fs.usda.gov/treesearch/content/pdf?name=Five-year%20operational%20trial%20of%20verbenone%20to%20deter%20mountain%20pine%20beetle%20(Dendroctonus%20ponderosae);%20Coleoptera:%20Scolytidae)%20attack%20of%20lodgepole%20pine%20(Pinus%20contorta)