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  1. 1
    Methane drainage study using an underground pipeline, Marianna mine 58 /
    by Prosser, L. J. (Leonard J.)
    Published 1981
    “...U.S. Dept. of the Interior, Bureau of Mines,...”
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    Government Document eBook
  2. 2
    Underground gob gas drainage during longwall mining /
    by Schatzel, Steven J.
    Published 1982
    “...U.S. Dept. of the Interior, Bureau of Mines,...”
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    Government Document Book
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