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1979
Brown, Kenneth Warren, G B. Wiersma, and Clyde W. Frank. A battery-operated air sampler for remote areas. Las Vegas, Nev.: Environmental Monitoring and Support Laboratory, Office of Research and Development, U.S. Environmental Protection Agency, 1979.
Wiersma, G.B., K.W. Brown, R. Herrman, C. Taylor, and J. Pope. Great Smoky Mountains Preliminary Study for Biosphere Reserve Pollutant Monitoring. Las Vegas, Nev. : Environmental Monitoring Systems Laboratory, Office of Research and Development, U.S. Environmental Protection Agency ; Springfield, Va. : National Technical Information Service distributor , 1979.