http://pec.lib.wvu.edu/record/P124121976Shortwall coal mining in the United States.<p> Serial issue. Issued as: West Virginia University. Coal Research Bureau. <em>Technical report</em>, no. 119. "Prepared for publication in <em>Coal Age</em>, 81, 3, (March, 1976), 82-88."</p>Peng, Syd S., 1939-Coal mines and mining--Research.Coal mines and mining--Safety measures.Mine roof bolting.14256