Map of Western Penna. showing the course of the principal anticlinal axes and the location of the large gas wells

Map of Western Penna. showing the course of the principal anticlinal axes and the location of the large gas wells. Compiled from reports of the second geological survey of Pennsylvania and corrected in some localities from personal observations by I.C White. Drawn by J.L. Johnston and C.E. Grafton. Published by The Petroleum Age, Bradford, Pa.

Caldwell, J. A. (Joseph A.)

1876

1876

Caldwell, J. A. (Joseph A.)

1:750 000

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