Author
Duffy, Edward W., 1947-
2
Bernhart, Benjamin L.,
1
Bernhart, John H. L. Dr.,
1
Bernhart, John L. Dr.,
1
Harwood, Herbert H., Jr
1
Meyers, Allen
1
Pennsylvania Railroad Technical & Historical Society. Philadelphia Chapter
1
Simulation Systems Inc
1
Southeastern Pennsylvania Transportation Authority
1
Southeastern Pennsylvania Transportation Authority. Service Planning Department
1
Spivak, Joel
1