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
Lester J. Cappon, editor-in-chief ; Barbara Bartz Petchenik, cartographic editor ; John Hamilton Long, assistant editor ; William B. Bedford [and three others], research associates ; Nancy K. Morbeck, cartographic assistant ; Gretchen M. Oberfranc, editorial assistant