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1
Apparent earth conductivity over coal mines as estimated from through-the-earth electromagnetic transmission tests
“…United States. Bureau of Mines…”
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Government Document Online Book -
2
The direct method of determining methane content of coalbeds for ventilation design
“…United States. Bureau of Mines…”
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Government Document Online Book -
3
Face ventilation measurement with sulfur hexafluoride (SF₆)
“…United States. Bureau of Mines…”
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Government Document Online Book -
4
Peak methane concentrations during coal mining an analysis /
“…United States. Bureau of Mines…”
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Government Document Online Book -
5
Remote fiber-optic methane monitor
“…United States. Bureau of Mines…”
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Government Document Online Book