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Johnson, Dale W., and Ivan J. Fernandez. "Soil Mediated Effects of Atmospheric Deposition on Eastern U.S. Spruce-Fir Forests." In Ecology and Decline of Red Spruce in the Eastern United States, 235-270. Vol. 96. New York, NY: Springer-Verlag, 1992.
Van Miegroet, Helga, Dale W. Johnson, Donald E. Todd, and J. D. Goodlaxson. Nitrogen Dynamics in High-Elevation Spruce Sites in the Great Smoky Mountains National Park In First Annual Southern Appalachian Man and the Biosphere Conference. Gatlinburg, TN: Tennessee Valley Authority, 1990.