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Sensitivity of Native Plant Species to Elevated Levels of Ozone In Third Annual Southern Appalachian Man and the Biosphere Conference. Gatlinburg, TN: Tennessee Valley Authority, 1992.
Ambient Ozone Effects on Gas Exchange and Total Non-Structural Carbohydrate Levels in Cutleaf Coneflower (Rudbeckia laciniata L.) Growing in Great Smoky Mountains National Park." Environmental Pollution 160, no. January (2012): 74-81.
"Interpreting Spatial Variation in Ozone Symptoms Shown by Cutleaf Cone Flower, Rudbeckia laciniata L." Environmental Pollution 125, no. 1 (2003): 61-70.
"Ozone Injury on Cutleaf Coneflower (Rudbeckia laciniata) and Crown-Beard (Verbesina occidentalis) in Great Smoky Mountains National Park." Environmental Pollution 125, no. 1 (2003): 53-59.
"Photosynthetic Responses of Microstegium vimineum (Trin.) A. Camus, a Shade-Tolerant, C4 Grass, to Variable Light Environments." Oecologia 114, no. 1 (1998): 11-19.
"Seasonal Development of Ozone-Induced Foliar Injury on Tall Milkweed (Asclepias exaltata) in Great Smoky Mountains National Park." Environmental Pollution 141, no. 1 (2006): 175-183.
"Seasonal Profiles of Leaf Ascorbic Acid Content and Redox State in Ozone-Sensitive Wildflowers." Environmental Pollution 143, no. 3 (2006): 427-434.
"Seedling Insensitivity to Ozone for Three Conifer Species Native to Great Smoky Mountains National Park." Environmental Pollution 108, no. 2 (2000): 141-151.
"Sensitivity of Seedlings of Black Cherry (Prunus serotina Ehrh.) to Ozone in Great Smoky Mountains National Park. I. Exposure-Response Curves for Biomass." New Phytologist 130, no. 3 (1995): 447-459.
"Stomatal Behavior of Ozone-Sensitive and -Insensitive Coneflowers (Rudbeckia laciniata var. digitata) in Great Smoky Mountains National Park." New Phytologist 173, no. 1 (2007): 100-109.
"Sub-Canopy Deposition of Ozone in a Stand of Cutleaf Coneflower." Environmental Pollution 131, no. 2 (2004): 295-303.
"Visible Foliar Injury Caused by Ozone Alters the Relationship between SPAD Meter Readings and Chlorophyll Concentrations in Cutleaf Coneflower." Photosynthesis Research 87, no. 3 (2006): 281-286.
"Sensitivity of Sycamore Seedlings (Platanus occidentalis) to Ozone in Great Smoky Mountains National Park Data from 1989. U. S. Department of the Interior, National Park Service, 1993.