Fettke, C. R. (Charles Reinhard). (1952). Oil and gas developments in Pennsylvania in 1951. [Harrisburg]: Commonwealth of Pennsylvania, Dept. of Internal Affairs, Topographic and Geologic Survey.MLA Citation
Fettke, Charles R. (Charles Reinhard), 1888-1959. Oil And Gas Developments In Pennsylvania In 1951. [Harrisburg]: Commonwealth of Pennsylvania, Dept. of Internal Affairs, Topographic and Geologic Survey, 1952.
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