Harper, J. A., & Cozart, C. L. (1989). Oil and gas developments in Pennsylvania in 1988. Harrisburg: Pennsylvania Bureau of Topographic and Geologic Survey.
Chicago Style CitationHarper, John A., and Cheryl L. Cozart. Oil and Gas Developments in Pennsylvania in 1988. Harrisburg: Pennsylvania Bureau of Topographic and Geologic Survey, 1989.
MLA CitationHarper, John A., and Cheryl L. Cozart. Oil and Gas Developments in Pennsylvania in 1988. Harrisburg: Pennsylvania Bureau of Topographic and Geologic Survey, 1989.
Warning: These citations may not always be 100% accurate.