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Johnson, Dale W., Helga Van Miegroet, Steven E. Lindberg, Donald E. Todd, and Robert B. Harrison. "Nutrient Cycling in Red Spruce Forests of the Great Smoky Mountains." Canadian Journal of Forest Research 21, no. 6 (1991): 769-787.
Garten, Charles T., and Helga Van Miegroet. Nitrogen Isotope Ratios in Plants as an Indicator of N Status in the Great Smoky Mountains In Third Annual Southern Appalachian Man and the Biosphere Conference. Gatlinburg, TN: Tennessee Valley Authority, 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.