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  1. 1
    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
  2. 2
    Geologic factors influencing the gas content of coalbeds in southwestern Pennsylvania /
    by Ulery, J. P. (James P.)
    Published 1988
    Get full text
    Government Document Book
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