Implementation of the new air quality standards for particulate matter and ozone : hearing before the Subcommittee on Clean Air, Climate Change, and Nuclear Safety of the Committee on Environment and Public Works, One Hundred Eighth Congress, second session, April 1, 2004.
Washington : U.S. G.P.O. : For sale by the Supt. of Docs., U.S. G.P.O., 2005.