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N. Stephens, Thomas, J. M. Rosenquest, and Barbara Lübkert. "Spatial and Temporal Ozone and Sulfur Dioxide Distribution in the Great Smoky Mountains." In 72nd Annual Meeting Air Pollution Control Association, 52. Cincinnati, Ohio, June 24-29, 1979, 1979.
N. Stephens, Thomas, Gary L. Larson, and Thomas F. Albee. "A Study of Ambient Air Quality and Visibility in National Parks." In 2nd Conference on Scientific Research in the National Parks, 130. Virginia Polytechnic Institute, 1979.