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 K. C.  Weathers, et al., ?Chemical concentrations in cloud water from four sites in the eastern United States?, in M. H. Unsworth and D. Fowler (eds.). Acidic Deposition at High Elevation Sites, 1988, p. 345-357.\par \par  K. C.  Weathers, et al., ?Cloudwater chemistry from ten sites in North America?, Environ. Sci. Technol., vol. 22, p. 1018-1026, 1988.\par \par  K. C.  Weathers, et al., ?A regional acidic cloud/fog water event in the eastern United States?, Nature, vol. 319, p. 657-658, 1986.\par \par }