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 C. T.  Driscoll, et al., ?Acid rain revisited: advances in scientific understanding since the passage of the 1970 and 1990 Clean Air Act Amendments?, vol. 1. p. 1-20, 2001.\par \par  C. T.  Driscoll, et al., ?Acidic deposition in the northeastern United States: sources and inputs, ecosystem effects, and management strategies?, BioScience, vol. 51, p. 180-198, 2001.\par \par }