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2. Planning and Operation of Gaseous Mines;Hargraves;CIM Bulletin,1973
3. How to Plan for Methane Control in Underground Coal Mines;Thakur;Mining Engineering,1977
4. Enhanced Recovery of Coalbed Methane Through Hydraulic Fracturing;Holditch,1988
5. Methane Flow in the Pittsburgh Seam;Thakur,1984