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1
Degasification of the Mary Lee coalbed near Oak Grove, Jefferson County, Ala., by vertical borehole in advance of mining
“…United States. Bureau of Mines…”
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2
Geologic factors causing roof instability and methane emission problems the Lower Kittaning coalbed, Cambria County, Pa. /
“…United States. Bureau of Mines…”
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3
Cleat in bituminous coalbeds
“…United States. Bureau of Mines…”
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4
Commercial-quality gas from the multipurpose borehole located in the Pittsburgh coalbed
“…United States. Bureau of Mines…”
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5
Hydraulic stimulation increases degasification rate of coalbeds
“…United States. Bureau of Mines…”
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Government Document Online Book