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Roof control strategies for underground coal mines [microform] / by William C. Smith (Information circular ; 9351)

Roof control strategies for underground coal mines [microform] / by William C. Smith (Information circular ; 9351)
Microform図書
1993<YCA-I 28.27:9351>
National Diet Library
  • Author HeadingSmith, W. C. (William Cyrille) , 1955-

Rib stability microform : practical considerations to optimize rib design / by W.C. Smith (Information circular ; 9323)

Rib stability microform : practical considerations to optimize rib design / by W.C. Smith (Information circular ; 9323)
Microform図書
1992<YCA-I 28.27:9323>
National Diet Library
  • Author HeadingSmith, W. C. (William Cyrille) , 1955-

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