Draingage of methane from the overlying Pocahontas no. 4 coalbed from workings in the Pocahontas no. 3 coalbed

Draingage of methane from the overlying Pocahontas no. 4 coalbed from workings in the Pocahontas no. 3 coalbed

by Gerald L Finfinger

1979 · 15 pages · Coal mines and mining · Mine ventilation

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