Philadelphia rapid transit system. Street car, bus and subway-elevated lines.
[Philadelphia] :  P.R.T., 
1936.
Insets: P.R.T. Lines and Delaware County; Central City District; P.R.T. Bus Routes 22 and 74 to Doylestown and Hatboro; P.R.T. Bus Route B to Somerton and South Langhorne.
References.