National Atmospheric Deposition Program
U.S. Environmental Protection Agency
U.S. Department of Energy
U.S. Government Accountability Office
Clean Air Act: Mercury Control Technologies at Coal-Fired Power Plants Have Achieved Substantial Emissions Reductions (GAO-10-47, October 2009)
Congressional Research Service
Mercury Emissions from Electric Power Plants: States Are Setting Stricter Limits
Other States, Interstate Organizations, or Foreign Governments
Private Sector and Non-Governmental Organizations