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History   Roen, John B. "Geology of the Devonian Black Shales of the Appalachian Basin." Organic Geochemistry 5.4 (1984): 241-54   DOE, Modern Shale Gas in the United States: A Primer (2009).   Overbey, William K. Increasing Eastern U.S. Natural Gas Reserves from Gas Bearing Shales. Rep. 1976. Web. Prepared for the Eastern Regional Meeting of the Society of Petroleum Engineers of AIME   http://www.propublica.org/special/from-gung-ho-to-uh-oh-charting-the-governments-moves-on-fracking