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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: 2001 National Park Service Gaseous Air Pollutant Monitoring Network In Annual Data Summary. Lakewood, CO: National Park Service, 2001.
Trails for America: Report on the Nationwide Trails Study. U. S. Department of the Interior, Bureau of Outdoor Recreation, 1966.
Great Smoky Mountains National Park Look Rock: 1989 Gaseous Pollutant and Meteorological Monitoring Annual Data Summary. Denver, Co: National Park Service, 1992.
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