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 P. M.  Groffman, et al., ?Methods for measuring denitrification: Diverse approaches to a difficult problem?, Ecol. Appl., vol. 16, p. 2091-2122, 2006.\par \par  G. B.  Lawrence, M. B.  David, W. C.  Shortle, S. W.  Bailey, and G. M.  Lovett, Mechanisms of base-cation depletion by acid deposition in forest soils of the northeastern U.S. 1999, p. 75-87.\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  M. J.  Mitchell, C. T.  Driscoll, R. D.  Fuller, M. B.  David, and G. E.  Likens, ?Effect of whole-tree harvesting on the sulfur dynamics of a forest soil?, Soil Sci. Soc. Am. J., vol. 53, p. 933-940, 1989.\par \par }