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Geologic factors causing roof instability and methane emission problems :the Lower Kittanning coalbed, Cambria County, Pa.

The direct method of determining methane content of coalbeds for ventilation design

Cleat in bituminous coalbeds

Selected geologic factors affecting mining of the Pittsburgh coalbed

Geologic investigations of underground coal mining problems

Use of surface joint and photolinear data for predicting subsurface coal cleat orientation

Determining cleat orientation of deeper coalbeds from overlying coals

Applying computer-drawn maps of geologic data to analysis of mining problems

Geological factors affecting methane in the Beckley coalbed

Methods of determining the orientations of bedrock fracture systems in southwestern Pennsylvania and northern West Virginia


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