Assessing the security of our critical transportation infrastructure : hearing before the Subcommittee on Surface Transportation and Merchant Marine Infrastructure, Safety and Security of the Committee on Commerce, Science, and Transportation, United States Senate, One Hundred Fourteenth Congress, second session, December 7, 2016

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United States. Congress. Senate. Committee on Commerce, Science, and Transportation. Subcommittee on Surface Transportation and Merchant Marine Infrastructure, Safety, and Security

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