Improving security and facilitating commerce at America's northern border and ports of entry : hearing before the Subcommittee on Immigration, Refugees and Border Security of the Committee on the Judiciary, United States Senate, One Hundred Twelfth Congress, first session, May 17, 2011.
Imprint
Washington : U.S. G.P.O. : For sale by the Supt. of Docs., U.S. G.P.O., 2012.