United States. Government Accountability Office. Maritime Security: Federal Efforts Needed to Address Challenges in Preventing and Responding to Terrorist Attacks on Energy Commodity Tankers, report, December 10, 2007; (https://digital.library.unt.edu/ark:/67531/metadc302480/m1/1/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .

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