PERC and NORA : hearing before the Subcommittee on Energy of the Committee on Energy and Natural Resources, United States Senate, One Hundred Eleventh Congress, second session, to receive testimony on the Propane Education and Research Council (PERC) and National Oilheat Research Alliance (NORA), September 29, 2010.
Washington : U.S. G.P.O. : For sale by the Supt. of Docs., U.S. G.P.O., 2010.