compiled from actual surveys, official records and private plans, by Ellis Kiser and J.M. Lathrop, under the direct management and supervision of A.H. Mueller, publisher
a cooperative project of the three Commonwealth Research Universities ; Temple University, editors, David J. Cuff, William J. Young ; University of Pittsburgh, [editor], Edward K. Muller ; The Pennsylvania State University, [editors] Wilbur Zelinsky, Ronald F. Abler