Maps. Ohio. Map of Berea sand of northern Ohio, prepared by James F. Pepper, David F. Demarest, Wallace de Witt, jr., Richard D. Holt, and Charles W. Merrels, 2nd, assisted by Gail M. Everhart, Mary E. Galpin, Violet M. Massarelli, and Glen E. Saam; oil and gas investigations, preliminary map 39. n. p.