Author
Southeastern Pennsylvania Transportation Authority
6
Mallowe, Mike
2
Philadelphia Dept. of City Transit
2
Philadelphia Rapid Transit Company
2
Philadelphia Transportation Co
2
Benner, Walter M., 1888-
1
Chandler Brothers & Co
1
Cox, Harold E.
1
Frankford Historical Society (Philadelphia, Pa.)
1
IRT Subway System (New York, N.Y.)
1
Interboroudh Rapid Transit Company (New York)
1
Lind, Alan R.
1
McKelvey, Gerald
1
National Railway Historical Society. Philadelphia Chapter
1
New York Chamber of commerce of the state of New York
1
Philadelphia Transportation Company
1
Rue, James R.
1
Sabatini, Richard
1
Sechler, Robert P.
1
Taylor, A. Merritt, 1874-
1