Author
Association of American Railroads
8
Philadelphia (Pa.). Urban Traffic and Transportation Board
6
Southeastern Pennsylvania Transportation Authority
6
Pennsylvania Public Utility Commission
4
Pennsylvania Railroad
4
Philadelphia (Pa.) Urban Traffic and Transportation Board
4
Baltimore and Ohio Railroad Company
3
Haupt, Herman, 1817-1905
3
Philadelphia Rapid Transit Company
3
Whidden, Guy C. 1868-
3
Allegheny and South Side Railway Company
2
Association of American Railroads. Railroad Committee for the Study of Transportation
2
Buckman, Morris
2
Camden and Amboy Railroad and Transportation Company
2
Carnesi, Mônica
2
Circus World Museum (Baraboo, Wis.)
2
Citizens' Committee on the Subject of the North Branch Canal (Bradford County, Pa.)
2
Commercial Exchange of Philadelphia (Pa.)
2
Cox, Harold E.
2
Fraley, F. 1804-1901
2
Garrett, John W. 1820-1884
2
Hesse-Wartegg, Ernst von, 1854-1918
2
Historical Records Survey (U.S.) New Jersey
2
International Congress of Navigation. Philadelphia,
2
Lane, Wheaton J.
2
Lauck, W. Jett 1879-1949
2
Lykens Valley Railroad and Coal Company
2
MacGill, Caroline E.
2
Marcosson, Isaac Frederick, 1876-1961
2
Meyer, Balthasar Henry, 1866-1954
2
Meyers, John F.
2
National Board of Trade
2
Neall, Frank L.
2
New Jersey Historical Records Survey Project
2
New Jersey State Planning Board
2
Omwake, John, 1885-
2
Pennsylvania Railroad,
2
Pennsylvania. General Assembly. Senate. Committee on the Judiciary
2
Reading Company
2
Schoff, Wilfred H. 1874-1932,
2
Shank, William H.
2
Shumway, George
2
Tucker, John, active 1862
2
United Mine Workers of America
2
United States Anthracite Coal Commission
2
United States. Interstate Commerce Commission
2
Allegheny and South Side Railway Company,
1
Ambler, Charles Henry, 1876-
1
Association of American Railroads. Bureau of Railway Economics. Library
1
Association of Centenary Firms and Corporations of the United States
1
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