Rail safety reauthorization [electronic resource] : 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 Tenth Congress, first session, May 22, 2007.
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Washington : U.S. G.P.O. : For sale by the Supt. of Docs., U.S. G.P.O., 2012.