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 M.  Havas, T.  Hutchinson, and G. E.  Likens, ?Acid rain research?, Environ. Sci. Technol., vol. 19, p. 20,26, 1985.\par \par  M.  Havas, T.  Hutchinson, and G. E.  Likens, ?Effect of low pH on sodium regulation in two species of Daphnia?, Can. J. Zool., vol. 62, p. 1965-1970, 1984.\par \par  M.  Havas, T.  Hutchinson, and G. E.  Likens, ?Red herrings in acid rain research?, Environ. Sci. Technol., vol. 18, p. 176A-186A, 1984.\par \par }