Changing energy markets and U.S. national security [electronic resource] : hearing before the Subcommittee on Terrorism, Nonproliferation, and Trade of the Committee on Foreign Affairs, House of Representatives, One Hundred Twelfth Congress, first session, December 16, 2011.
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Washington : U.S. G.P.O. : For sale by the Supt. of Docs., U.S. G.P.O., 2011.