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MLA
Sisson, Warren Elmer, Jr.
Effects of the Balsam Woolly Aphid (adelges Piceae (ratzburg)) On the Cambial Activity of Grand Fir (abies Grandis (dougl.) Lindl.) and Subalpine Fir (abies Lasiocarpa (hook.) Nutt.).
: Oregon State University, 1971.