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 K. F.  Crowley, et al., ?Do Nutrient Limitation Patterns Shift from Nitrogen Toward Phosphorus with Increasing Nitrogen Deposition Across the Northeastern United States??, Ecosystems, vol. 15, p. 940-957, 2012.\par \par  C. T.  Driscoll, et al., ?Acidic deposition in the northeastern United States: Sources and inputs, ecosystem effects and management strategies?, in J. M. Gunn, R. J. Steedman, and R. A. Ryder (eds.), 2004, p. 159-190.\par \par  C. T.  Driscoll, et al., ?Response to W. E. Sharpe's "Acid deposition explains sugar maple decline in the East"?, BioScience, vol. 52, p. 5-6, 2002.\par \par  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  G. B.  Lawrence, et al., ?Soil calcium status and the response of stream chemistry to declining acid rain?, Ecol. Appl., vol. 9, p. 1059-1072, 1999.\par \par }