Estimated shale oil and shale gas resources in the United States and in 137 shale formations in 41 other countries represent 10% of the world’s crude oil and 32% of the world’s natural gas technically recoverable resources.
August 30, 2017 / Barron News-Shield
July 27, 2017 / NASDAQ
July 25, 2016 /
January 11, 2016 / NASDAQ OMX
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December 1, 2015 / E&P
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June 19, 2015 / The Motley Fool
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