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1992
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.
1990
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.