The Geology of the Oil Regions of Warren, Venango, Clarion, and Butler Counties

The Geology of the Oil Regions of Warren, Venango, Clarion, and Butler Counties - Including surveys of the Garland and Panama conglomerates in Warren and Crawford, and in Chautauqua Co., N. Y., descriptions of oil well rig and tools, and a discussion is an unchanged, high-quality reprint of the original edition of 1880.
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