that the oil is a drainage from the coal beds; and your correspondent (page 211 of the current volume of your journal) gives another, which is, that the oil of Westerp. Peansylvania is the ...
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TAIYUAN -- North China's coal-rich Shanxi province achieved a record coal-bed methane (CBM) output of 13.4 billion cubic meters in 2024, up 18.9 percent year on year, according to the provincial ...