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Dinh-Zarr, Tho Bella. : Nominations to the National Highway Traffic Safety Administration, U.S. Department of Transportation and the National Transportation Safety Board : hearing before the Committee on Commerce, Science, and Transportation, United States Senate, One Hundred Thirteenth Congress, second session, December 3, 2014.
Railroads -- United States -- Dining-car service -- Finance. : Reviewing alternatives to Amtrak's annual losses in food and beverage service : hearing before the Subcommittee on Government Operations of the Committee on Oversight and Government Reform, House of Representatives, One Hundred Thirteenth Congress, first session, November 14, 2013.
Dinitrogen fixation -- See Nitrogen Fixation Here are entered works on the process of taking up free nitrogen, either by microorganisms or by technical or natural processes. Works on the formation of nitrites and nitrates in soil, sewage sludge, etc. from other nitrogenous compounds by microorganisms are entered under Nitrification.