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 J. G.  Kerr, et al., ?The effect of seasonal drying on sulphate dynamics in streams across southeastern Canada and the northeastern USA?, Biogeochemistry, 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  D. S.  Ross, et al., ?Spatial patterns of soil nitrification and nitrate export from forested headwaters in the northeastern United States?, J. Geophys. Res - Biogeo, vol. 117, 2012.\par \par  J. L.  Campbell, et al., ?Consequences of climate change for biogeochemical cycling in forests of northeastern North America?, Can. J. For. Res., vol. 39, 2009.\par \par  J. L.  Campbell, et al., ?Long-term trends from ecosystem research at the Hubbard Brook Experimental Forest?, Gen. Tech. Rep. NRS-17. Newtown Square, PA: U.S. Dept. Agriculture, Forest Service, Northern Research Station, p. 41, 2007.\par \par  J. L.  Campbell, M. J.  Mitchell, B.  Mayer, P. M.  Groffman, and L. M.  Christenson, ?Mobility of nitrogen-15-labeled nitrate and sulfur-34-labeled sulfate during snowmelt?, Soil Sci. Soc. Am. J., vol. 71, p. 1934-1944, 2007.\par \par  J. L.  Campbell, M. J.  Mitchell, P. M.  Groffman, and L. M.  Christenson, ?Winter in northeastern North America: An often overlooked but critical period for ecological processes?, Front. Ecol. Environ., vol. 3, p. 314-322, 2005.\par \par  J. L.  Campbell, et al., ?Input-output budgets of inorganic nitrogen for 24 forest watersheds in the northeastern United States: A Review?, Water Air Soil Pollut., vol. 151, p. 373-396, 2004.\par \par  J. L.  Campbell, J. W.  Hornbeck, W. H.  McDowell, D. C.  Buso, J. B.  Shanley, and G. E.  Likens, ?Dissolved organic nitrogen budgets for upland, forested ecosystems in New England?, Biogeochemistry, vol. 49, p. 123-142, 2000.\par \par }