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HE 20.7131:8022
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Geologic investigations of underground coal mining problems |
1 |
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HE 20.7131:8025
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Commercial-quality gas from the multipurpose borehole located in the Pittsburgh coalbed |
1 |
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HE 20.7131:8043
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Measuring the methane content of bituminous coalbeds |
1 |
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HE 20.7131:8047
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Hydraulic stimulation increases degasification rate of coalbeds |
1 |
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HE 20.7131:8066
|
Two-phase flow in coalbeds |
1 |
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HE 20.7131:8093
|
Selected geologic factors affecting mining of the Pittsburgh coalbed |
1 |
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HE 20.7131:8097
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Rotary drilling holes in coalbeds for degasification |
1 |
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HE 20.7131:8120
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Use of surface joint and photolinear data for predicting subsurface coal cleat orientation |
1 |
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HE 20.7131:8217
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Methods of determining the orientations of bedrock fracture systems in southwestern Pennsylvania and northern West Virginia |
1 |
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HE 20.7131:8392
|
Forecasting methane hazards in metal and nonmetal mines |
1 |
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HE 20.7131:8407
|
Methane content and geology of the Hartshorne coalbed in Haskell and Le Flore Counties, Okla |
1 |
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HE 20.7131:8424
|
A fail-safe control system for a mine methane pipeline |
1 |
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HE 20.7131:8459
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Three coal mine gob degasification studies using surface foreholes and a bleeder system |
1 |
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HE 20.7131:8473
|
Face ventilation measurement with sulfur hexafluoride (SF₆) |
1 |
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HE 20.7131:8515
|
Direct method determination of the gas content of coal procedures and results |
1 |
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HE 20.7131:8525
|
Assessing the methane hazard of gassy coals in storage silos |
1 |
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HE 20.7131:8567
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Evaluation of the seismic system for locating trapped miners |
1 |
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HE 20.7131:8577
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Methane drainage study using an underground pipeline, Marianna mine 58 |
1 |
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HE 20.7131:8640
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Drilling a horizontal coalbed methane drainage system from a directional surface borehole |
1 |
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HE 20.7131:8644
|
Underground gob gas drainage during longwall mining |
1 |