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Citation
Frye, Robert H. and Noel D. Wygant. 1971. “Spruce Beetle Mortality in Cacodylic Acid-Treated Engelmann Spruce Trap Trees.” Special Collections, USDA National Agricultural Library. Accessed October 4, 2026, https://www.nal.usda.gov/exhibits/speccoll/items/show/5355.
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