United States. Interstate Commerce Commission 2,469
United States. Congress. House 1,558
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United States. Congress. Senate. Committee on Commerce 387
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United States. Congress. House. Committee on Public Lands 288
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United States. Bureau of Foreign Commerce 213
United States. Post Office Department 199
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Cartography Associates 163
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United States. Congress. House. Committee on Claims 160
United States. Congress. House. Committee on Commerce 158
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United States Railroad Labor Board 155
United States. Congress. House. Committee on Transportation and Infrastructure. Subcommittee on Railroads, Pipelines, and Hazardous Materials 154
United States. Congress. House. Committee on the District of Columbia 150
United States. General Accounting Office 150
United States. Congress. Senate. Committee on Commerce, Science, and Transportation 141
United States. Congress. House. Committee on the Judiciary 140
United States. Congress. Senate. Committee on Claims 131
United States. Federal Railroad Administration. Office of Research and Development 128
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United States. Department of Commerce and Labor. Bureau of Statistics 120
United States. Congress. Senate. Committee on Public Lands 112
United States. Bureau of Foreign and Domestic Commerce 108
United States. Congress. Senate. Committee on the Judiciary 100
Brotherhood of Locomotive Engineers (U.S.) 97
United States. General Land Office 93
Brotherhood of Locomotive Firemen and Enginemen 92
United States. Congress. House. Committee on the Territories 92
Library of Congress. Congressional Research Service 91
United States. Congress. House. Committee on Transportation and Infrastructure 91
United States. Federal Railroad Administration 87
United States. Congress. Senate. Committee on the District of Columbia 85
United States. Army. Quartermaster Corps 83
United States. Congress. House. Committee on the Pacific Railroads 77
United States. Congress. House. Committee on Transportation and Infrastructure. Subcommittee on Railroads 74
United States. Government Accountability Office 74
United States. Congress. Senate. Committee on Commerce, Science, and Transportation. Subcommittee on Surface Transportation 71
Isthmian Canal Commission (U.S.) 70
Great Britain 69
United States. Congress. Senate. Committee on Interstate and Foreign Commerce 67
United States. War Department. Engineer Department 66
Roosevelt, Theodore, 1858-1919 65
United States. President (1901-1909 : Roosevelt) 65
United States. Congress. House. Committee on Interstate and Foreign Commerce. Subcommittee on Transportation and Commerce 64
United States. Congress. Senate. Committee on Indian Affairs 64
United States. Congress. Senate. Committee on Labor and Public Welfare 64
United States. Supreme Court 61
Pan American Union 59
United States. Congress. House. Committee on Territories 59
Rand McNally and Company 56
United States. Congress. House. Committee on Ways and Means 56
United States. Department of Justice 56
Association of American Railroads. Railroad Committee for the Study of Transportation 55
Mann, James Robert, 1856-1922 54
United States. Congress. Senate. Committee on Commerce. Subcommittee on Surface Transportation 53
International Bureau of the American Republics 52
United States. Congress. House. Committee on Interior and Insular Affairs 52
United States. Department of the Interior. Office of Indian Affairs (1849-1947) 52
United States. Congress. Senate. Committee on Public Lands and Surveys 51
Cleveland, Grover, 1837-1908 50
United States. National Transportation Safety Board 50
United States. President (1885-1889 : Cleveland) 50
Wheeler, Burton Kendall, 1882-1975 49
Sheppard, Morris, 1875-1941 48
Martin, Thomas Staples, 1847-1919 47
Staggers, Harley Orrin, 1907-1991 46
United States. Army. Corps of Engineers 46
Lauck, W. Jett (William Jett), 1879-1949 43
United States. Congress. Senate. Committee on Finance 43
United States. Congress. Senate. Committee on Territories 43
United States. National Mediation Board 43
United States. Congress. Senate. Committee on Labor and Public Welfare. Subcommittee on Railroad Retirement 42
Baltimore and Ohio Railroad Company 41
United States. Bureau of Mines 41
United States. Congress. Senate. Committee on Commerce, Science, and Transportation. Subcommittee on Surface Transportation and Merchant Marine 41
United States. Congress. Senate. Committee on Commerce, Science, and Transportation. Subcommittee on Surface Transportation and Merchant Marine Infrastructure, Safety, and Security 41
Nelson, Knute, 1843-1923 40
United States. Department of the Treasury. Bureau of Statistics 40
United States. Congress. House. Committee on Interstate and Foreign Commerce. Subcommittee on Transportation and Aeronautics 39
Canal Zone 38
National Research Council (U.S.). Transportation Research Board 38
Maine. Legislature. House of Representatives 37
Dale, Porter Hinman, 1867-1933 36
United States. Department of Transportation 36
United States. Congress. Senate. Committee on Railroads 35
United States. Department of the Navy 35