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Selected geologic factors affecting mining of the Pittsburgh coalbed

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

Methane gas content of the Mary Lee group of coalbeds, Jefferson, Tuscaloosa, and Walker Counties, Ala.

Geology of the Mary Lee Group of coalbeds, Black Warrior coal basin, Alabama

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

Directionally controlled drilling to horizontally intercept selected strata, upper Freeport coalbed, Green County, Pa.

Directional drilling for coalbed degasification :program goals and progress in 1978


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