Is market concentration in the U.S. petroleum industry harming consumers? : hearing before the Joint Economic Committee, Congress of the United States, One Hundred Tenth Congress, first session, May 23, 2007.
Washington : U.S. G.P.O. : For sale by the Supt. of Docs., U.S. G.P.O., 2007.
Mode of access via the GPO Access web site. Address as of 3/25/08: http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=110_senate_hearings&docid=f:37461.pdf; current access is available via PURL.