NATO [electronic resource] : the Chicago Summit and U.S. policy : hearing before the Subcommittee on Europe and Eurasia of the Committee on Foreign Affairs, House of Representatives, One Hundred Twelfth Congress, second session, April 26, 2012.
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Washington : U.S. G.P.O. : For sale by the Supt. of Docs., U.S. G.P.O., 2012.