-
1
Methods of determining the orientations of bedrock fracture systems in southwestern Pennsylvania and northern West Virginia
“…United States. Bureau of Mines…”
Get full text
Government Document Online Book -
2
The direct method of determining methane content of coalbeds for ventilation design
“…United States. Bureau of Mines…”
Get full text
Government Document Online Book -
3
Geologic factors causing roof instability and methane emission problems the Lower Kittaning coalbed, Cambria County, Pa. /
“…United States. Bureau of Mines…”
Get full text
Government Document Online Book -
4
Cleat in bituminous coalbeds
“…United States. Bureau of Mines…”
Get full text
Government Document Online Book -
5
Geologic investigations of underground coal mining problems
“…United States. Bureau of Mines…”
Get full text
Government Document Online Book -
6
Measuring the methane content of bituminous coalbeds
“…United States. Bureau of Mines…”
Get full text
Government Document Online Book -
7
Use of surface joint and photolinear data for predicting subsurface coal cleat orientation
“…United States. Bureau of Mines…”
Get full text
Government Document Online Book -
8
Selected geologic factors affecting mining of the Pittsburgh coalbed
“…United States. Bureau of Mines…”
Get full text
Government Document Online Book