Map of the Second Berea sand in Gallia, Meigs, Athens, Morgan, and Muskingum Counties, Ohio - Pepper, James F.; Demarest, D.; Holt, R.D.; de Witt Jr., W.; Gray, H.H.; Mead, H.H.; Merrels, C.W.; Massarelli, Violet; Everhart, Gail; Averitt, P. (Oil and Gas Investigation Map, 1944)