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2. World Shale Gas Resources: An Initial Assessment of 14 Regions Outside the United States;Advanced Resources International,2011
3. Basic Well Log Analysis;Asquith,2004
4. Regional geology of the Middle Devonian Marcellus Shale, Appalachian Basin, presentation;Avary,2008
5. Play UDs: Upper Devonian black shales;Boswell,1996