01892oam 2200481 a 450 991069703010332120230902162156.0(CKB)5470000002384603(OCoLC)424368747(EXLCZ)99547000000238460320090711d2009 ua 0engurmn|||||||||txtrdacontentcrdamediacrrdacarrierClean Air Act[electronic resource] preliminary observations on the effectiveness and costs of mercury control technologies at coal-fired power plants : testimony before the Subcommittee on Clean Air and Nuclear Safety, Committee on Environment and Public Works, U.S. Senate /statement of John B. Stephenson[Washington, D.C.] :U.S. Govt. Accountability Office,[2009]1 online resource (29 pages) illustrationsTestimony ;GAO-09-860TTitle from PDF title screen (GAO, viewed July 11, 2009)."For release ... July 9, 2009."Includes bibliographical references.Testimony ;GAO-09-860T.Clean Air Act AirPollutionUnited StatesAir quality managementUnited StatesEnvironmental monitoringUnited StatesMercuryAirPollutionAir quality managementEnvironmental monitoringMercury.Stephenson John B1380816United States.Congress.Senate.Committee on Environment and Public Works.Subcommittee on Clean Air and Nuclear Safety.United States.Government Accountability Office.ESRESRGPOBOOK9910697030103321Clean Air Act3500535UNINA