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Butler TJ, Cohen MD, Vermeylen FM, Likens GE, Schmeltz D, Artz RS. Regional precipitation mercury trends in the eastern USA, 1998-2005:  Declines in the Northeast and Midwest, but no change in the Southeast.  2008;42:1582-1592.\par \par Evers DC, Butler TJ, Han YJ, Driscoll CT, Kamman NC, Goodale WM, Lambert KF, Holsen TM, Chen CY, Clair TA. Biological mercury hotspots in the northeastern United States and southeastern Canada.  2007;57:1-15.\par \par Butler TJ, Likens GE, Vermeylen FM, Stunder BJB. The impact of changing nitrogen oxide emissions on wet and dry nitrogen deposition in the northeastern USA.  2005;39:4851-4862.\par \par Likens GE, Buso DC, Butler TJ. Long-term relationships between SO2 and NOX emissions and SO42- and NO3- concentration in bulk deposition at the Hubbard Brook Experimental Forest, New Hampshire.  2005;7(10):964-968.\par \par Driscoll TC, Weathers KC, Lawrence GB, Bulger AJ, Butler TJ, Cronan CS, Eagar C, Lambert KF, Likens GE, Stoddard JL. Acidic deposition in the northeastern United States: Sources and inputs, ecosystem effects and management strategies. In: and J. M. Gunn, R. J. Steedman RRA Boreal Shield Watersheds, Section III: Biological Effects and Management Reactions. Boreal Shield Watersheds, Section III: Biological Effects and Management Reactions. ; 2004. p. 159-190.\par \par Butler TJ, Likens GE, Vermeylen FM, Stunder BJB. The relation between NO(x) emissions and precipitation NO3- in the eastern USA.  2003;37(15):2093-2104.\par \par Gilliland AB, Butler TJ, Likens GE. Monthly and annual bias in weekly (NADP/NTN) versus daily (AIRMoN) precipitation chemistry data in the Eastern USA.  2002;36:5197-5206.\par \par Driscoll CT, Weathers KC, Lawrence GB, Bulger AJ, Butler TJ, Cronan CS, Eagar C, Lambert KF, Likens GE, Stoddard JL. Response to W.E. Sharpe's Acid deposition explains sugar maple decline in the East.  2002;52(1):6-May.\par \par Driscoll CT, Weathers KC, Lawrence GB, Bulger AJ, Butler TJ, Cronan CS, Eagar C, Lambert FK, Likens GE, Stoddard JL. Acid Rain Revisited: advances in scientific understanding since the passage of the 1970 and 1990 Clean Air Act Amendments.  2001;1(1):20-Jan.\par \par Likens GE, Butler TJ, Buso DC. Long- and short-term changes in sulfate deposition: Effects of The 1990 Clean Air Act Amendments.  2001;52(1):11-Jan.\par \par Butler TJ, Likens GE, Stunder BJB. Regional-scale impacts of Phase I of the Clean Air Act Amendments: The relation between emissions and concentrations, both wet and dry.  2001;35(6):1015-1028.\par \par Likens GE, Weathers KC, Butler TJ, Buso DC. Solving the acid rain problem.  1998;282(5396):1991-1992.\par \par Hedin LO, Granat L, Likens GE, Buishand TA, Galloway JN, Butler TJ, Rodhe H. Steep declines in atmospheric base cations in regions of Europe and North America.  1994;367:351-354.\par \par Butler TJ, Likens GE. The impact of changing regional emissions on precipitation chemistry in the eastern United States.  1991;25A(2):305-315.\par \par Butler TJ, Likens GE. Impact of changing regional emissions on precipitation chemistry in the eastern U.  1990;71(2):110.\par \par Likens GE, Hedin LO, Butler TJ. Some long-term precipitation chemistry patterns at the Hubbard Brook Experimental Forest: extremes and averages.  1990;24(1):128-135.\par \par Butler TJ, Cogbill CV, Likens GE. Effect of climatology on precipitation acidity.  1984;65(6):639-640.\par \par Cogbill CV, Likens GE, Butler TJ. Uncertainties in historical aspects of acid precipitation: getting it straight.  1984;18(10):2261-2270.\par \par Likens GE, Butler TJ. Recent acidification of precipitation in North America.  1981;15(7):1103-1109.\par \par }