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Showing 1 - 2 results of 2 for search '"Coal mines and mining Pennsylvania."', query time: 0.16s Refine Results
  1. 1
    Geology, mining, and methane content of the Freeport and Kittanning coalbeds in Indiana and surrounding counties, Pa. /
    by Puglio, D. G. (Donald G.)
    Published 1979
    Subjects: “...Coal mines and mining Pennsylvania....”
    Government Document Book
  2. 2
    Geologic factors in predicting coal mine roof-rock stability in the upper Kittanning coalbed, Somerset County, Pa. /
    Published 1981
    Subjects: “...Coal mines and mining Pennsylvania Somerset County Safety measures....”
    Government Document Book
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