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Air Pollution Issues Great Smoky Mountains National Park In EPA National Air Pollutant Emission Trends, 1990-1994., 1996.
Clear: A Clearer Look at Eastern Air Resources. Denver, CO: National Park Service, 1993.
Geologic Map and Structure Sections of the Great Smoky Mountains National Park and Vicinity Tennessee and North Carolina. Geological Survey Professional Paper 587 plate 1. Washinton, DC: U.S. Geological Survey, 1967.