1. Oil and gas data from Devonian and Silurian rocks in the Appalachian Basin [cartographic material]
1975. 2013-08-27T17:29:06Z. 2013-09-04T19:52:20Z. De Witt, Wallace, Jr., 1920-2012. U.S. Geological Survey. English. Public. Appalachian Basin. Devonian and Silurian.
