Maps. Ohio. Map of Berea sand of southeastern Ohio, northern West Virginia, and southwestern Pennsylvania, shows thickness of sand and oil and gas pools in sand, prepared by James F. Pepper, David F. Demarest, Richard D. Holt, Wallace de Witt, jr., 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 29 [with text] by James F. Pepper and David F. Demarest. Scale 25 m.=8.4 in. n. p.