Catalog Record: Roof bolting patterns at the four-way entry intersections | HathiTrust Digital Library

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Roof bolting patterns at the four-way entry intersections /
by Syd S. Peng and S. Okubo.

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Main Author: Peng, Syd S., 1939-
Related Names: Okubo, S.
Language(s): English
Published: Morgantown, W. VA. : Coal Research Bureau, West Virginia University, [1976?].
Subjects: Coal mines and mining > Coal mines and mining / Safety measures.
Mine roof bolting.
Physical Description: 30 p. : ill. ; 28 cm.
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