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  1. 1
    Influence of subjacent gob on longwall development mining in the Upper Kittanning Coalbed of south-central Pennsylvania /
    by Bauer, Eric R.
    Published 1992
    Government Document Microform Book
  2. 2
    Effects of ancient stream channel deposits on mine roof stability : a case study /
    by Ingram, David K.
    Published 1987
    Government Document Microform Book
  3. 3
    Determining the source of longwall gob gas : Lower Kittanning Coalbed, Cambria County, PA /
    by Diamond, W. P. (William P.)
    Published 1992
    Government Document Microform Book
  4. 4
    Longwall retreat of gate road pillars /
    by Listak, Jeffrey M.
    Published 1993
    Government Document Microform Book
  5. 5
    Neutralization of acidic discharges from abandoned underground coal mines by alkaline injection /
    by Aljoe, William W.
    Published 1993
    Government Document Microform Book
  6. 6
    Long-term removal and retention of iron and manganese from acidic mine drainage by wetlands.
    Published 1990
    Government Document Microform Book
  7. 7
    Characterization and effectiveness of remining abandoned coal mines in Pennsylvania.
    by Hawkins, Jay W.
    Published 1995
    Government Document Microform Book
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