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Hacker, David W., James R. Renfro, and Howard S. Neufeld. 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.
Hacker, David W., and James R. Renfro. Ozone Response of Selected Plant Species from the Great Smoky Mountains National Park In First Annual Southern Appalachian Man and the Biosphere Conference. Gatlinburg, TN: Tennessee Valley Authority, 1990.
Hacker, David W., and James R. Renfro. "Great Smoky Mountains Plants Studies for Ozone Sensitivity." Park Science: A Resource Management Bulletin 12, no. 1 (1992): 6-7.