Showing 1 - 2 results of 2 for search '"Coal Geology Pennsylvania Armstrong County."', query time: 0.14s Refine Results
  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 Geology Pennsylvania Armstrong County....”
    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 Geology Pennsylvania Armstrong County....”
    Get full text
    Government Document Book
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