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U.S. Government

Bureau of Land Management: http://www.blm.gov/
Environmental Protection Agency (EPA): http://www.epa.gov
Mine Safety and Health Administration (MSHA): http://www.msha.gov
Occupational Safety and Health Administration (OSHA): http://www.osha.gov
Office of Surface Mining: http://www.osmre.gov/
U.S. Geological Survey: http://www.usgs.gov