Author
United States General Accounting Office
979
United States Federal Highway Administration
971
Organisation for Economic Co-operation and Development
913
National Research Council (U.S.) Transportation Research Board
694
United States Interstate Commerce Commission
635
United States Department of Transportation
630
United States Bureau of Public Roads
495
European Conference of Ministers of Transport
494
United States Urban Mass Transportation Administration
477
United States Board of Engineers for Rivers and Harbors
476
ebrary, Inc
471
Round Table on Transport Economics Paris, France
443
United States
425
United States Congress. House. Committee on Interstate and Foreign Commerce
422
United States Post Office Department
411
United States Congress. House. Committee on Merchant Marine and Fisheries
399
United States Federal Transit Administration
388
Rupp Collection (Athenaeum of Philadelphia)
361
United States National Highway Traffic Safety Administration
360
United States Congress. Senate. Committee on Interstate Commerce
338
United States Bureau of the Census
316
United States Congress. Senate. Committee on Interstate and Foreign Commerce
311
United States Army. Corps of Engineers
308
European Conference of Ministers of Transport Economic Research Centre
302
Transit Cooperative Research Program
282
Transit Development Corporation
260
United States Maritime Administration
253
United States Congress. House. Committee on Post Office and Civil Service
216
Association of American Railroads Railroad Committee for the Study of Transportation
211
United States National Transportation Safety Board
207
United States Federal Communications Commission
205
United States Interstate Commerce Commission. Bureau of Transport Economics and Statistics
203
American Association of State Highway and Transportation Officials
196
United States Congress. Senate. Committee on Commerce
189
United States Congress. House. Committee on Post Office and Post Roads
188
United States Federal Aviation Administration
183
SpringerLink (Online service)
180
Technology Sharing Program (U.S.)
175
ProQuest (Firm)
174
Transportation Systems Center
162
United States Interstate Commerce Commission. Bureau of Accounts
161
De Gruyter
158
United States Bureau of Transportation Statistics
154
United States Department of Transportation. Office of the Secretary
150
United States Shipping Board
145
International Telecommunication Union
144
International Transport Forum
143
Baltimore and Ohio Railroad Company
136
Water Resources Support Center (U.S.)
130
United States Congress House
129
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