Weak links: assessing the vulnerability of U.S. ports and weather the government is adequately structures to safeguard them : [microfiche] : Hrg. before the omm. on gov. affairs, U.S. senate, 107th congr., 1st sess., Dec. 6, 2001. - Washington : U.S. gov. print. off., 2002. - 4 microfiches ; 105x148mm. - (S.Hrg.107-309)[MFN: 3544]