1968. 2012-10-10T13:40:51Z. 2013-03-18T20:33:43Z. Zietz, Isidore, 1919-. Dept. of the Interior, U.S. Geological Survey. English. Public. Kentucky, Tennessee, North Carolina, Virginia, West Virginia, and Southern States.
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1928. 2011-05-27T19:51:19Z. 2015-10-21T15:00:04Z. Geological Survey (U.S.). Dept. of the Interior, U.S. Geological Survey. English. Public. Botetourt County (Va.), Christiansburg (Va.), Craig County (Va.), Floyd County (Va.), Franklin County (Va.), Giles County (Va.), Monroe County (W. Va.), Montgomery County (Va.), Roanoke County (Va.), Virginia, and West Virginia.
