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2. Technological Improvement in Petroleum Exploration and Development;Douglas R Bohi;Productivity in Natural Resource Industries: Improvement through Innovation,1999
3. Recent Developments of the Barnett Shale Play, Fort Worth Basin;Kent A Bowker;West Texas Geological Society Bulletin,2003
4. The Natural Gas Shortage and the Regulation of Natural Gas Producers;Stephen Breyer;Harvard Law Review,1973
5. Worst Drought in More Than a Century Strikes Texas Oil Boom;Joe Carroll;Bloomberg.com,2011