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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.
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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.
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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.