| Distribution of Marcellus Shale |
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| Written by Designed by Robert C. Milici, USGS |
| Saturday, 07 July 2007 09:54 |
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Special thanks to Mr. Robert C. Milici, Research Geologist, USGS, for his illustration of the Marcellus Shale. |
| Last Updated on Friday, 17 June 2011 11:40 |
