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United States Department of Agriculture


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https://www.fs.usda.gov/treesearch/content/pdf?name=Inter-%20and%20Intrapopulation%20Variation%20of%20the%20Pheromone,%20Ipsdienol%20Produced%20by%20Male%20Pine%20Engravers%20Ips%20pini%20(Say)%20(Coleoptera:%20Scolytidae)