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

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