%0 Generic %T NOx state implementation plans : hearing before the Subcommittee on Clean Air, Wetlands, Private Property, and Nuclear Safety of the Committee on Environment and Public Works, United States Senate, One Hundred Sixth Congress, first session, June 24, 1999. %U https://ezaccess.libraries.psu.edu/login?url=https://www.heinonline.org/HOL/Page?handle=hein.cbhear/noxsip0001&id=1&size=2&collection=congrec&index=cbhear