Timbering along the robbing line :
factors influencing falls of roof in coal mines /
by J.W. Paul.

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Main Author: Paul, J. W. (James Washington)
Language(s): English
Published: Washington, D.C. : U.S. Dept. of Commerce, Bureau of Mines, 1927.
Subjects: Coal mines and mining > Coal mines and mining / Safety measures.
Mine timbering.
Physical Description: 2 p. ; 23 cm.
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