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2. Coalbed gas systems, resources, and production and a review of contrasting cases from the San Juan and Powder River basins;W B Ayers;AAPG Bulletin,2002
3. Possible controls of hydrogeological and stress regimes on the producibility of coalbed methane in Upper Cretaceous-Tertiary strata of the Alberta basin;S Bachu;Canada: AAPG Bulletin,2003
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5. Preliminary evaluation of gas content of the No.2 coal seam in the Yanchuannan area, southeast Ordos basin;Y D Cai;China: Journal of Petroleum Science and Engineering,2014