Methane control in Eastern U.S. coal mines : proceeding of the Symposium of the Bureau of Mines, Industry Technology Transfer Seminar, Morgantown, W. Va., May 30-31, 1973
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Methane control in Eastern U.S. coal mines : proceeding of the Symposium of the Bureau of Mines, Industry Technology Transfer Seminar, Morgantown, W. Va., May 30-31, 1973

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