Age of the Bedford Shale, Berea Sandstone, and Sunbury Shale in the Appalachian and Michigan basins, Pennsylvania, Ohio, and Michigan / by Wallace De Witt, Jr.
- Physical Description: 1 online resource (iii, 11 pages) : illustrations.
- Publisher: [Washington, D.C.] : United States Department of the Interior, Geological Survey, 1970.
- Distributor: Washington : United States Government Printing Office
|General Note:|| Title from title screen (viewed September 15, 2014).
|Bibliography, etc. Note:|| Includes bibliographical references ( pages 10-11).
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- Geological Survey bulletin ; 1294-G
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- Geological Survey bulletin ; 1294-G.
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