Oil and gas developments in Pennsylvania in 1991 / by Cheryl L. Cozart and John A. Harper.

Chicago citation style
Cozart, Cheryl L. Oil and gas developments in Pennsylvania in 1991 / by Cheryl L. Cozart and John A. Harper.. Retrieved from the Digital Public Library of America, https://archive.org/details/oilgasdevelopmen00coza. (Accessed September 22, 2018.)
APA citation style
Cozart, Cheryl L, Oil and gas developments in Pennsylvania in 1991 / by Cheryl L. Cozart and John A. Harper.. Retrieved from the Digital Public Library of America, https://archive.org/details/oilgasdevelopmen00coza
MLA citation style
Cozart, Cheryl L. Retrieved from the Digital Public Library of America <https://archive.org/details/oilgasdevelopmen00coza>.
Note: These citations are programmatically generated and may be incomplete.