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  • Diamond, W. P.; Oyler, D. C.; Fields, H. H.
    view article (9.9981365)

    Directionally Controlled Drilling to Horizontally Intercept Selected Strata, Upper Freeport Coalbed, Greene County, PA.
    Bureau of Mines, Pittsburgh, PA
    RI 8231, 1977, 24 p.

  • Oyler, D. C.
    view article (9.992496)

    Use of a Sodium Silicate Gel Grout for Plugging Horizontal Methane-Drainage Holes.
    Bureau of Mines, Pittsburgh, PA
    RI 8843, 1984, 23 p.