Author

Harper, John L.

2 books found

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

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

Cheryl L. Cozart · First published 1993

Placeholder cover for Oil and gas developments in Pennsylvania in 1987 / by John A. Harper and Cheryl L. Cozart.

Oil and gas developments in Pennsylvania in 1987 / by John A. Harper and Cheryl L. Cozart.

John A. Harper · First published 1988