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Chappelka, Arthur H., Greg L. Somers, and James R. Renfro. "Temporal Patterns of Foliar Ozone Smptoms on Tall Milkweed (Asclepias exaltata L.) in Great Smoky Mountains National Park." \i Environmental Pollution\i0  149, no. 3 (2007): 358-365.\par \par Girardot, Steven P., Barry P. Ryan, Susan M. Smith, Wayne T. Davis, Charles B. Hamilton, Richard A. Obenour, James R. Renfro, Kimberly A. Tromatore, and Gregory D. Reed. "Ozone and PM2.5 Exposure and Acute Pulmonary Health Effects: A Study of Hikers in the Great Smoky Mountains National Park." \i Environmental Health Perspectives\i0  114, no. 7 (2006): 1044-1052.\par \par Girardot, Steven P., Kimberly A. Tromatore, Yun F. Lam, Ryan W. Malone, Cynthia A. Atterholt, Wayne T. Davis, Charles B. Hamilton, James R. Renfro, Barry P. Ryan, Susan M. Smith et al. "Preliminary Findings From the Great Smoky Mountains National Park Air Quality and Hiker Health Study." \i Epidemiology\i0  15, no. 4 (2004): S216.\par \par Chappelka, Arthur H., Howard S. Neufeld, Alan W. Davison, Greg L. Somers, and James R. Renfro. "Ozone Injury on Cutleaf Coneflower (Rudbeckia laciniata) and Crown-Beard (Verbesina occidentalis) in Great Smoky Mountains National Park." \i Environmental Pollution\i0  125, no. 1 (2003): 53-59.\par \par Neufeld, Howard S., E. H. Lee, James R. Renfro, and David W. Hacker. "Seedling Insensitivity to Ozone for Three Conifer Species Native to Great Smoky Mountains National Park." \i Environmental Pollution\i0  108, no. 2 (2000): 141-151.\par \par Chappelka, Arthur H., John M. Skelly, Greg L. Somers, James R. Renfro, and Elisabeth Hildebrand. "Mature Black Cherry Used as a Bioindicator of Ozone Injury." \i Water, Air, and Soil Pollution\i0  116, no. 1-2 (1999): 261-266.\par \par Chappelka, Arthur H., Greg L. Somers, and James R. Renfro. "Visible Ozone Injury on Forest Trees in Great Smoky Mountains National Park, USA." \i Water Air and Soil Pollution\i0  116, no. 1-2 (1999): 255-260.\par \par Chappelka, Arthur H., Greg L. Somers, James R. Renfro, and P. Rosseau. "Empirical Evidence of Growth Decline Related to Visible Ozone Injury." \i Forest Ecology and Management\i0  104, no. 1-3 (1998): 129.\par \par Chappelka, Arthur H., James R. Renfro, Greg L. Somers, and Bruce Nash. "Evaluation of Ozone Injury on Foliage of Black Cherry (Prunus serotina) and Tall Milkweed (Asclepias exaltata) in Great Smoky Mountains National Park." \i Environmental Pollution\i0  95, no. 1 (1997): 13-18.\par \par Evans, Lance S., John H. Adamski, and James R. Renfro. "Relationships between Cellular Injury, Visible Injury of Leaves, and Ozone Exposure Levels for Several Dicotyledonous Plant Species at Great Smoky Mountains National Park." \i Environmental and Experimental Botany\i0  36, no. 2 (1996): 229-237.\par \par Neufeld, Howard S., Henry E. Lee, James R. Renfro, David W. Hacker, and Ben-Hui Yu. "Sensitivity of Seedlings of Black Cherry (Prunus serotina Ehrh.) to Ozone in Great Smoky Mountains National Park. I. Exposure-Response Curves for Biomass." \i New Phytologist\i0  130, no. 3 (1995): 447-459.\par \par Neufeld, Howard S., and James R. Renfro. \i Sensitivity of Sycamore Seedlings (Platanus occidentalis) to Ozone in Great Smoky Mountains National Park Data from 1989\i0 . U. S. Department of the Interior, National Park Service, 1993.\par \par Chappelka, Arthur H., Elisabeth Hildebrand, John M. Skelly, Deborah Mangis, and James R. Renfro. \i Effects of the Ambient Ozone Concentrations on Mature Eastern Hardwood Trees Growing in Great Smoky Mountains\i0  In \i 85th Annual Meeting and Exhibition, Air and Waste Management Association\i0 . Kansas City, Missouri, 1992.\par \par Hacker, David W., and James R. Renfro. "Great Smoky Mountains Plants Studies for Ozone Sensitivity." \i Park Science:  A Resource Management Bulletin\i0  12, no. 1 (1992): 6-7.\par \par Chappelka, Arthur H., and James R. Renfro. \i Ozone Biomonitoring Trend Plots and Surveys in Great Smoky Mountains National Park\i0  In \i Third Annual Southern Appalachian Man and the Biosphere Conference\i0 . Gatlinburg, TN: Tennessee Valley Authority, 1992.\par \par Hacker, David W., James R. Renfro, and Howard S. Neufeld. \i Sensitivity of Native Plant Species to Elevated Levels of Ozone\i0  In \i Third Annual Southern Appalachian Man and the Biosphere Conference\i0 . Gatlinburg, TN: Tennessee Valley Authority, 1992.\par \par Hacker, David W., and James R. Renfro. \i Ozone Response of Selected Plant Species from the Great Smoky Mountains National Park\i0  In \i First Annual Southern Appalachian Man and the Biosphere Conference\i0 . Gatlinburg, TN: Tennessee Valley Authority, 1990.\par \par Renfro, James R., and Becki Van Cleave. \i An Evaluation of the Backcountry Camping Permit System for 1983 and 1986 at Great Smoky Mountains National Park\i0 . Gatlinburg, TN: Uplands Field Research Laboratory, Great Smoky Mountains National Park, 1989.\par \par Peine, John Douglas, and James R. Renfro. \i Visitor Use Patterns at Great Smoky Mountains National Park\i0  In \i Research/Resources Management Report\i0 . Gatlinburg, TN: Uplands Field Research Laboratory, 1988.\par \par }