Books by John A. Harper
Paddles!
Oil and gas developments in Pe
Oil and gas developments in Pennsylvania in 1989 (Progress report)
Oil and gas developments in Pe
Oil and gas developments in Pennsylvania in 1987 (Progress report)
Oil and gas developments in Pe
Oil and gas developments in Pennsylvania in 1987 / by John A. Harper and Cheryl L. Cozart.
Geology of the oil and gas fie
Geology of the oil and gas fields of southwestern Pennsylvania
Oil and gas developments in Pe
Oil and gas developments in Pennsylvania in 1985 / by John A. Harper.
Oil and gas developments in Pennsylvania in 1984 (Progress report)
Oil and gas developments in Pe
Oil and gas developments in Pennsylvania in 1984 / by John A. Harper.
Oil and gas developments in Pe
Oil and gas developments in Pennsylvania in 1983 (Progress report)
Oil and gas developments in Pe
Oil and gas developments in Pennsylvania in 1983 / by John A. Harper.
Oil and gas developments in Pe
Oil and gas developments in Pennsylvania in 1981 / compiled by John A. Harper.
Oil and gas developments in Pe
Oil and gas developments in Pennsylvania in 1980 with ten year review and forecast / compiled by John A. Harper