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G. Wiersma, Bruce, C. W. Frank, Kenneth W. Brown, and Cliff I. Davidson. Lead Particles in the Great Smoky Mountains Biosphere Reserve. Las Vegas, Nevada: Environmental Monitoring Systems Laboratory, Office of Research and Development, U.S. Environmental Protection Agency, 1980.
G. Wiersma, Bruce, Kenneth W. Brown, Ray Herrmann, C. Taylor, and J. Pope. Great Smoky Mountains Preliminary Study for Biosphere Reserve Pollutant Monitoring. Las Vegas, Nevada: Environmental Monitoring Systems Laboratory, Office of Research and Development, U.S. Environmental Protection Agency, 1979.
G. Wiersma, Bruce. "Development of a Pollutant Monitoring System for Biosphere Reserves and Results of the Great Smoky Mountains Pilot Study." In 4th Joint Conference on Sensing of Environmental Pollutants, 451-456. New Orleans, LA : American Chemical Society, 1978.