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by U.s. Department of Transportation
by National Aeronautics and Space Administration
by United States General Accounting Office
by Congressional Research Service
by United States Congress; United States House of Representatives; Committee on Transportation and Infrastructure
by United States General Accounting Office Gao
by Akhtar, Engr Naheed; Hashmi, Hashim Nisar; Hussain, Raja Rizwan
by United States Government Accountability Office