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- [7] Variation of Gas Content in Coalbed Methane Development 2011 XI'AN INTERNATIONAL CONFERENCE ON FINE EXPLORATION AND CONTROL OF WATER & GAS IN COAL MINES, 2011, 3 : 131 - 137
- [9] Mudlogging method calculates coalbed gas content Donovan, W.S., 1600, PennWell Publishing Co. (98):