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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 m...

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 HeadingGround control (Mining) -- Pennsylvania -- Ebensburg Region Longwall ...

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