Pennsylvania. Bureau of Topographic and Geologic Survey"Richard R. Hice, State Geologist."; Contour interval 100 feet.; Originally published as part of Oil and gas map of southwestern Pennsylvania, 1915 (Harrisburg, Pa.: W.S. Ray, State Printer, 1916).69 x 70 CentimetersJPEGUMN_ALMA:9940420590001701engThe Survey (Pennsylvania)PublicOil and gas pools of southwestern PennsylvaniaMapsPennsylvaniaUniversity of Minnesota