Shales   Utica Shale


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33 989 February 24, 2018
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0 369 December 30, 2015
0 354 December 15, 2015
0 310 December 10, 2015
0 387 November 11, 2015
1 987 January 9, 2015
7 905 April 7, 2013
0 336 November 30, 2012
2 349 December 17, 2011