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Associated Press
FILE -This Wednesday, May 9, 2012, file photo, shows  drilling rig near Kennedy, Texas, Wednesday, May 9, 2012. Some thought the South Texas area known as Eagle Ford Shale would never produce much oil, but now the Department of Energy predicts it holds 3.4 billion. Some even expect 10 billion, which would make it the biggest oil field in U.S. history. (AP Photo/Eric Gay, File)

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