2006. 2007-02-05T17:25:14Z. 2012-01-06T15:03:15Z. U.S. Geological Survey ; For sale by U.S. Geological Survey, Information Services. English. Public. Wisconsin, Superior Region, Douglas County, and Bayfield County.
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2006. 2012-01-13T19:48:51Z. 2012-03-05T17:33:06Z. Ryder, Robert T. U.S. Geological Survey ; For sale by U.S. Geological Survey, Information Services. English. Public. Appalachian Basin, Ohio, West Virginia, Appalachian Basin., Ohio., and West Virginia. Silurian.