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Reston: U.S. Geological Survey, 2018
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Reston, Va.: U.S. Department of the Interior, U.S. Geological Survey, 2016
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Ottawa: Natural Resources Canada, 2014
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London: Department of Energy & Climate Change, 2013
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London: Department of Energy & Climate Change, 2013
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Reston, Va: U.S. Geological Survey, 2008
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Tulsa, OK: AAPG, august 22, 2019
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Reston: U.S. Geological Survey, 2019
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Reston: U.S. Geological Survey, 2018
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Reston: U.S. Geological Survey, 2018
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Tulsa, OK: AAPG, january 9, 2017
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Reston: U.S. Geological Survey, 2017
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Reston: U.S. Geological Survey, 2017
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Reston: U.S. Geological Survey, 2017
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Tulsa, OK: AAPG, april 20, 2015
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Ottawa: Geological Survey of Canada, 2007
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Ottawa: Geological Survey of Canada, 2007
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Reston: U.S. Geological Survey, 2019
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Reston: U.S. Geological Survey, 2018
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Reston: U.S. Geological Survey, 2018