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  • McCulloch, C. M.; Diamond, W. P.; Bench, B. M.; Deul, M.
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    Selected Geologic Factors Affecting Mining of the Pittsburgh Coalbed.
    Bureau of Mines, Philadelphia, PA
    RI 8093
    RI 8093
    1975
    77 p.

  • Diamond, W. P.; Oyler, D. C.; Fields, H. H.
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    Directionally Controlled Drilling to Horizontally Intercept Selected Strata, Upper Freeport Coalbed, Greene County, PA.
    Bureau of Mines, Pittsburgh, PA
    RI 8231
    RI 8231
    1977
    24 p.