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