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1979
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.
1980
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.