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Longwall retreat of gate road pillars microform / by J.M. Listak and E.R. Bauer (Report of investigations ; 9444)

Longwall retreat of gate road pillars microform / by J.M. Listak and E.R. Bauer (Report of investigations ; 9444)
Microform図書
1993<YCA-I 28.23:9444>
National Diet Library
  • Subject HeadingGround control (Mining) -- Pennsylvania Pillaring (Mining) Longwall mining -- Pennsylvania

Longwall gate road roof instability and methods of control in the lower Kittanning Coalbed of Central Pennsylvania microform / by E.R. Bauer, J.M. Listak, and E.D. Krupa (Information circular ; 9331)

Longwall gate road roof instability and methods of control in the lower Kittanning Coalbed of Central Pennsylvania microform / by E.R. Bauer, J.M. Listak, and E.D. Krupa (Information circular ; 9331)
Microform図書
1992<YCA-I 28.27:9331>
National Diet Library
  • Subject HeadingMine roof control -- Testing Longwall mining -- Pennsylvania -- Cambria County

Subsidence due to undermining of sloping terrain : a case study / by Paul W. Jeran and Vladimir Adamek (Report of investigations ; 9205)

Subsidence due to undermining of sloping terrain : a case study / by Paul W. Jeran and Vladimir Adamek (Report of investigations ; 9205)
Microform図書
1988<YCA-I 28.23:9205>
National Diet Library
  • Subject HeadingMine subsidences -- Pennsylvania Longwall mining -- Pennsylvania

Influence of subjacent gob on longwall development mining in the Upper Kittanning Coalbed of south-central Pennsylvania microform / by E.R. Bauer, G.J. Chekan, and G.P. Sames (Report of investigations ; 9403)

Influence of subjacent gob on longwall development mining in the Upper Kittanning Coalbed of south-central Pennsylvania microform / by E.R. Bauer, G.J. Chekan, and G.P. Sames (Report of investigations ; 9403)
Microform図書
1992<YCA-I 28.23:9403>
National Diet Library
  • Subject Heading...ensburg Region Longwall mining -- Pennsylvania -- Ebensburg Region Coal mine...

Determining the source of longwall gob gas microform : Lower Kittanning Coalbed, Cambria County, PA / by William P. Diamond, James P. Ulery, and Stephen J. Kravits (Report of investigations ; 9430)

Determining the source of longwall gob gas microform : Lower Kittanning Coalbed, Cambria County, PA / by William P. Diamond, James P. Ulery, and Stephen J. Kravits (Report of investigations ; 9430)
Microform図書
1992<YCA-I 28.23:9430>
National Diet Library
  • Subject Heading...Cambria County Longwall mining -- Pennsylvania -- Cambria County Mine ventil...

Comparison of aerial and ground surveying of subsidence over an active longwall / by John C. LaScola (Report of investigations ; 9214)

Comparison of aerial and ground surveying of subsidence over an active longwall / by John C. LaScola (Report of investigations ; 9214)
Microform図書
1988<YCA-I 28.23:9214>
National Diet Library
  • Subject Heading...-- Measurement Longwall mining -- Pennsylvania -- Waynesburg Region -- Safet...

Comparisons between cross-measure boreholes and surface gob holes / by T.W. Goodman and J. Cervik (Report of investigations ; 9013)

Comparisons between cross-measure boreholes and surface gob holes / by T.W. Goodman and J. Cervik (Report of investigations ; 9013)
Microform図書
1986<YCA-I 28.23:9013>
National Diet Library
  • Subject Heading...ion -- Testing Longwall mining -- Pennsylvania -- Ebensburg Region Boring --...

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