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 C. T.  Driscoll, G. E.  Likens, L. O.  Hedin, J. S.  Eaton, and F. H.  Bormann, ?Changes in the chemistry of surface waters: 25-year results at the Hubbard Brook Experimental Forest, New Hampshire?, Environ. Sci. Technol., vol. 23, p. 137-143, 1989.\par \par }