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  1. 1
    Reducing hazards in underground coal mines through the recognition and delineation of coalbed discontinuities caused by ancient channel processes /
    by Kertis, Carla A.
    Published 1985
    Subjects: “...Coal mines and mining Pennsylvania Armstrong County Safety measures....”
    Government Document Book
  2. 2
    Reducing hazards in underground coal mines through the recognition and delineation of coalbed discontinuities caused by ancient channel processes /
    by Kertis, Carla A.
    Published 1985
    Subjects: “...Coal mines and mining Pennsylvania Armstrong County Safety measures....”
    Get full text
    Government Document Book
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