https://www.ohiogeosoc.org/wp-content/uploads/2024/08/Logo.png00Joel Sminchakhttps://www.ohiogeosoc.org/wp-content/uploads/2024/08/Logo.pngJoel Sminchak2024-02-20 13:43:142024-02-20 13:47:32History of Structure Contour Mapping in the Appalachian Basin: 1870-1917, Jim McDonald