Responding to the Inspector General's findings of improper use of national security letters by the FBI : hearing before the Subcommittee on the Constitution of the Committee on the Judiciary, United States Senate, One Hundred Tenth Congress, first session, April 11, 2007.
Washington : U.S. G.P.O. : For sale by the Supt. of Docs., U.S. G.P.O., 2007.