Serial issue. Issued as: West Virginia University. Coal Research Bureau. Technical report, no. 119. "Prepared for publication in Coal Age, 81, 3, (March, 1976), 82-88."
Subject Topical:
Coal mines and mining--Research., Coal mines and mining--Safety measures., Mine roof bolting.
All:
Coal mines and mining--Research., Coal mines and mining--Safety measures., Mine roof bolting.