Aviation safety [electronic resource] : pilot fatigue : hearing before the Subcommittee on Aviation Operations, Safety, and Security of the Committee on Commerce, Science, and Transportation, United States Senate, One Hundred Eleventh Congress, first session, December 1, 2009.
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Washington : U.S. G.P.O. : For sale by the Supt. of Docs., U.S. G.P.O., 2010.