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 T. J.  Butler, et al., ?Response of ozone and nitrate to stationary source NOx emission reductions in the eastern USA?, Atmos. Environ., vol. 45, p. 1084-1094, 2011.\par \par  T.  Butler, M.  Cohen, F. M.  Vermeylen, G. E.  Likens, R. S.  Artz, and D.  Schmeltz, ?Regional precipitation mercury trends in the eastern USA, 1998-2005: Declines in the Northeast and Midwest, no trend in the Southeast?, Atmos. Environ., vol. 42, p. 1582-1592, 2008.\par \par  T. J.  Butler, G. E.  Likens, F. M.  Vermeylen, and B. J. B.  Stunder, ?The impact of changing nitrogen oxide emissions on wet and dry nitrogen deposition in the northeastern USA?, Atmospheric Environment, vol. 39, p. 4851-4862, 2005.\par \par  T. J.  Butler, G. E.  Likens, F. M.  Vermeylen, and B. J. B.  Stunder, ?The relation between NOx emissions and precipitation NO3- in the eastern USA?, Atmospheric Environment, vol. 37, p. 2093-2104, 2003.\par \par }