U.S. G.P.O. : For sale by the Supt. of Docs., U.S. G.P.O.,
The ExxonMobil-XTO merger : impact on U.S. energy markets : hearing before the Subcommittee on Energy and Environment of the Committee on Energy and Commerce, One Hundred Eleventh Congress, second session, January 20, 2010.
United States. Congress. House. Committee on Energy and Commerce. Subcommittee on Energy and Environment.
The ExxonMobil-XTO merger : impact on U.S. energy markets : hearing before the Subcommittee on Energy and Environment of the Committee on Energy and Commerce, One Hundred Eleventh Congress, second session, January 20, 2010.