. . "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 of the preglacial and postglacial drainage of the Lake Erie country" . . . . . . "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 of the preglacial and postglacial drainage of the lake Erie county. By John F. Carll"@en . . "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 of the preglacial and postglacial drainage of the Lake Erie country" . . . . . . . . . "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 of the preglacial and postglacial drainage of the lake Erie country" . . . . . "Second Geological Survey of Pennsylvania : 1875 to 1879" . . "Second Geological Survey of Pennsylvania : 1875 to 1879"@en . . "Second geological survey of Pennsylvania : 1875 to 1879" . . "The geology of the oil regions of warren, venango, clarion and butler counties"@en . "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 of the preglacial and postglacial drainage of the lake Erie country"@en .