Nodvin, Stephen C., and Ellen M. Williams. "Nitrate and Sulfate Export from a Great Smoky Mountains Spruce-Fir Watershed." In Fifth Tennessee Water Resources Symposium, 66-72. Nashville, TN: American Water Resources Association  - Tennessee Section, 1992.

Williams, Ellen M., and Stephen C. Nodvin. Nitrate Export from a Great Smoky Mountain Spruce-Fir Watershed In Third Annual Southern Appalachian Man and the Biosphere Conference. Gatlinburg, TN: Tennessee Valley Authority, 1992.