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https://www.fs.usda.gov/treesearch/content/pdf?name=Cone%20and%20seed%20insects%20in%20Douglas-fir,%20Pseudotsuga%20menziesii%20(Mirb.)%20Franco,%20seed%20orchards%20in%20the%20western%20United%20States:%20Distribution%20and%20relative%20impact.%20Can