"Virginia." . . "Petroleum" . . "Petroleum Kentucky." . . "Geology Kentucky." . . "Petroleum Virginia." . . . . . . . "Prepared in cooperation with the Division of Geology of the Virginia Department of Conservation and Development."@en . . . "Geology and oil and gas possibilities of Upper Mississippian rocks of southwestern Virginia, southern West Virginia and eastern Kentucky" . . . . "Geology and oil and gas possibilities of upper Mississippian rocks of southwestern Virginia, southern West Virginia and eastern Kentucky"@en . . . "Geology and oil and gas possibilities of Upper Mississippian rocks of southwestern Virginia, southern West Virginia, and eastern Kentucky" . . . . . . . . . . . . . . . "Geology and oil and gas possibilities of upper Mississippian rocks of southwestern Virginia, southern West Virginia, and eastern Kentucky"@en . "Contributions to economic geology"@en . . . . . . . . . . . . . "Petroleum West Virginia." . . "Geology." . . "Kentucky." . . "Geology Virginia." . . . . "West Virginia." . . "Geology West Virginia." . . "Geological Survey (U.S.)," . .