http://pec.lib.wvu.edu/record/P3191952Cambrian, Ordovician, Silurian, and Devonian systems of West Virginia, by Herbert P. Woodward. Journal article reprint from: <em>The Bulletin of the American Association of Petroleum Geologists</em>, v.36:no.11 (1952:Nov.). Review of four articles by Herbert Preston Woodward which were published in <em>West Virginia Geological Survey</em>, including: "Cambrian System of West Virginia", "Ordovician Systems of West Virginia", "Silurian Systems of West Virginia", and "Devonian Systems of West Virginia."Bevan, Arthur.Geology, Stratigraphic--Cambrian.Geology, Stratigraphic--Devonian.Geology, Stratigraphic--Ordovician.Geology, Stratigraphic--Silurian.Geology--West Virginia.14256