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 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  R. T.  Venterea, P. M.  Groffman, M. S.  Castro, L. V.  Verchot, I. J.  Fernandez, and M. B.  Adams, ?Soil emissions of nitric oxide in two forest watersheds subjected to elevated inputs?, For. Ecol. Manage, vol. 196, p. 335-349, 2004.\par \par }