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 R. J.  Hall, C. T.  Driscoll, and G. E.  Likens, ?Importance of hydrogen ions and aluminum in regulating the structure and function of stream ecosystems: an experimental test?, Freshwater Biol., vol. 18, p. 17-43, 1987.\par \par  R. J.  Hall and G. E.  Likens, ?Experimental acidification of a stream tributary to Hubbard Brook?. p. 6, 1985.\par \par  R. J.  Hall, C. T.  Driscoll, G. E.  Likens, and J. M.  Pratt, ?Physical, chemical and biological consequences of episodic aluminum additions to a stream?, Limnol. Oceanogr., vol. 30, p. 212-220, 1985.\par \par  R. J.  Hall and G. E.  Likens, ?Effect of discharge rate on biotic and abiotic chemical flux in an acidified stream?, Can. J. Fish. Aquat. Sci., vol. 41, p. 1132-1138, 1984.\par \par }