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  1. 1
    Methane control on longwalls with cross-measure boreholes (Lower Kittanning coalbed) /
    by Garcia, F. (Fred)
    Published 1985
    Subjects: “...Longwall mining Pennsylvania Cambria County Safety measures....”
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    Government Document Book
  2. 2
    Methane control on longwalls with cross-measure boreholes (Lower Kittanning Coalbed) /
    by Garcia, F. (Fred)
    Published 1985
    Subjects: “...Longwall mining Pennsylvania Cambria County Safety measures....”
    Government Document Book
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