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Clear: A Clearer Look at Eastern Air Resources. Denver, CO: National Park Service, 1993.
Trails for America: Report on the Nationwide Trails Study. U. S. Department of the Interior, Bureau of Outdoor Recreation, 1966.
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.
Air Pollution Issues Great Smoky Mountains National Park In EPA National Air Pollutant Emission Trends, 1990-1994., 1996.
Great Smoky Mountains National Park Cove Mountain: 1989 Gaseous Pollutant and Meteorological Monitoring Annual Data Summary. Denver, Co: U.S. Department of the Interior, National Park Service, 1992.
Great Smoky Mountains National Park Cove Mountain: 1990 Gaseous Pollutant and Meteorological Monitoring Annual Data Summary. Denver, Co: U.S. Department of the Interior, National Park Service, 1992.
Great Smoky Mountains National Park Look Rock: 1989 Gaseous Pollutant and Meteorological Monitoring Annual Data Summary. Denver, Co: National Park Service, 1992.
Great Smoky Mountains National Park Look Rock: 1990 Gaseous Pollutant and Meteorological Monitoring Annual Data Summary. Denver, CO: U.S. Department of the Interior, National Park Service, 1992.
Great Smoky Mountains National Park Look Rock: 2001 National Park Service Gaseous Air Pollutant Monitoring Network In Annual Data Summary. Lakewood, CO: National Park Service, 2001.