Reducing nuclear and biological threats at the source [electronic resource] : hearing before the Subcommittee on Prevention of Nuclear and Biological Attack of the Committee on Homeland Security, U.S. House of Representatives, One Hundred Ninth Congress, second session, June 22, 2006.
Washington : U.S. G.P.O. : For sale by the Supt. of Docs., U.S. G.P.O., 2007.