P. P. Karan and Cotton Mather, editors ; David Oakes, cartographer ; John Fraser Hart and James E. Queen, consultants ; Gyula Pauer, map design ; contributors Wilford A. Bladen ... [and others]
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