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検索結果 2 件

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)
マイクロ図書
1992<YCA-I 28.27:9331>
国立国会図書館
  • 件名Mine roof control -- Testing Longwall mining -- Pennsylvania -- Cambria County

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)
マイクロ図書
1992<YCA-I 28.23:9430>
国立国会図書館
  • 件名...Cambria County Longwall mining -- Pennsylvania -- Cambria County Mine ventilation

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