Abstract
Relationship between the clay fabric of roof shales and roof collapse in mines of the Herrin coal, Southern Illinois : Bodus, T M Rock Mechanics as a Guide for Efficinet Utilization of Natural Resources: Proc 30th U.S. Symposium, Morgantown, 19–22 June 1989 P605–612. Publ Rotterdam: A A Balkema, 1989
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