Author
Roberts, Charles S (Charles Swann)
8
Springirth, Kenneth C
8
Messer, David W
5
Bezilla, Michael
4
Pennsylvania Board of Canal Commissioners
4
Pennsylvania Railroad
4
Pennsylvania Railroad Technical & Historical Society
4
Rupp Collection (Athenaeum of Philadelphia)
4
United States National Park Service
4
America's Industrial Heritage Project
3
Bednar, Mike, 1948-
3
Cupper, Dan
3
Kobus, Ken
3
Plant, Jeremy F., 1945-
3
United States National Transportation Safety Board
3
Wakefield, Manville B (Manville Burton), 1924-
3
Westing, Fred, 1903-
3
Allegheny Portage Railroad
2
Archer, Samuel
2
Bache, Hartman, 1797-1872
2
Cass, Lewis, 1782-1866
2
Consoli, Jack
2
Couper, Wm (William), 1884-
2
Crosby, David (David B.)
2
Delaware Valley Regional Planning Commission
2
Duffy, Edward W., 1947-
2
Edward Potts Cheyney Memorial Fund
2
Emerson, Harrington, 1853-1931
2
Hedge, Egbert
2
Lescure, J. M. G.
2
Paige, John C
2
Pennsylvania Society for the Promotion of Internal Improvements in the Commonwealth
2
Schlatter, Charles L
2
Seidel, David W
2
Solomon, Brian, 1966-
2
United States Army. Corps of Engineers
2
United States Congress House
2
United States Congress. House. Committee on Roads and Canals
2
Watson, David
2
Weber, David L
2
Wendler, Eugen
2
Wilson, William Hasell, 1811-1902
2
Adams, William Lawrence
1
Albrecht, Harry P
1
Anderson, Elaine, 1917-
1
Andrews, Clinton T
1
Archer, Robert F
1
Barry, Steve
1
Bernhart, Benjamin L
1
Biery, Thomas A
1
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