File:Geology of oil and gas fields in Steubenville, Burgettstown, and Claysville quadrangles, Ohio, West Virginia, and Pennsylvania (IA geologyofoilgasf00gris).pdf
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![File:Geology of oil and gas fields in Steubenville, Burgettstown, and Claysville quadrangles, Ohio, West Virginia, and Pennsylvania (IA geologyofoilgasf00gris).pdf](https://upload.wikimedia.org/wikipedia/commons/thumb/d/d8/Geology_of_oil_and_gas_fields_in_Steubenville%2C_Burgettstown%2C_and_Claysville_quadrangles%2C_Ohio%2C_West_Virginia%2C_and_Pennsylvania_%28IA_geologyofoilgasf00gris%29.pdf/page1-353px-Geology_of_oil_and_gas_fields_in_Steubenville%2C_Burgettstown%2C_and_Claysville_quadrangles%2C_Ohio%2C_West_Virginia%2C_and_Pennsylvania_%28IA_geologyofoilgasf00gris%29.pdf.jpg?20200816070815)
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