The impact of background and security clearances on the transportation workforce [electronic resource] : hearing before the Subcommittee on Transportation Security and Infrastructure Protection of the Committee on Homeland Security, House of Representatives, One Hundred Tenth Congress, first session, February 16, 2007.
Imprint
Washington : U.S. G.P.O. : For sale by the Supt. of Docs., U.S. G.P.O., 2009.