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1
Geologic structure in the plateaus region of Northern Pennsylvania and its relation to the occurrence of gas in the Oriskany sand /
by Cathcart, S. H. (Stanley Holman), 1889-
[Harrisburg, Pa.] : Commonwealth of Pennsylvania, Dept. of Internal Affairs, Bureau of Topographic and Geological Survey, 1934

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Book
2
Oil and gas developments in Pennsylvania in 1975 /
by Lytle, William S., Piotrowski, Robert G., Heyman, Louis
Harrisburg, Pa. : Pennsylvania, Bureau of Topographic and Geologic Survey, 1976

Government Document Book
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