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  • Fraley, J. E.
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    Submersion Testing of Coatings for Sealing Shale.
    Bureau of Mines, Pittsburgh, PA
    RI 8215
    RI 8215
    1977
    23 p.

  • Fraley, J. E.; Simpson, R. E.
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    Magnesium Oxysulfate Cement Sealant in Coal Mines.
    Bureau of Mines, Philadelphia, PA
    RI 8150
    RI 8150
    1976
    20 p.