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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  P. M.  Groffman, et al., ?Long-Term Integrated Studies Show Complex and Surprising Effects of Climate Change in the Northern Hardwood Forest?, BioScience, vol. 62, no. 12, p. 1056 - 1066, 2012.\par \par  G. M.  Lovett and C. L.  Goodale, ?A new conceptual model of nitrogen saturation based on experimental nitrogen addition to an oak forest?, Ecosystems, vol. 14, p. 615-631, 2011.\par \par  R. Q.  Thomas, C. D.  Canham, K. C.  Weathers, and C. L.  Goodale, ?Increased tree carbon storage in response to nitrogen deposition in the U.S.?, Nat. Geosci., vol. 3, p. 13-17, 2010.\par \par  C.  Evans, et al., ?Does elevated nitrogen deposition or ecosystem recovery from acidification drive increased dissolved organic carbon loss from upland soil? A review of evidence from field nitrogen addition experiments?, Biogeochemistry, vol. 91, p. 13-35, 2008.\par \par  L. H.  Pardo, P. H.  Templer, C. L.  Goodale, S.  Duke, P. M.  Groffman, and G. M.  Lovett, ?Regional assessment of N saturation using foliar and root delta N-15?, Biogeochemistry, vol. 80, p. 143-171, 2006.\par \par  C. T.  Driscoll, et al., ?Nitrogen pollution in the northeastern United States: Sources, effects and management options?, BioScience, vol. 53, p. 357-374, 2003.\par \par  C. T.  Driscoll, et al., ?Nitrogen pollution: Sources and consequences in the U.S. northeast?, Environment, vol. 45, p. 9-22, 2003.\par \par  J. D.  Aber, et al., ?Inorganic N losses from a forested ecosystem in response to physical, chemical, biotic and climatic perturbations?, Ecosystems, vol. 5, p. 648-658, 2002.\par \par }