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  1. Report of Research on Pennsylvania's Coal Resources IPR-20

    Resource Type: Report
    Creator: H.B. Charmbury, C.J. Zink, Robert W. Rissinger, Joseph Kershetsky, R.P. Aikman, John Todhunter, G.L. Barthauer, John Seddon, and William Sturm
    Keyword: Interim Progress Report and Coal Resources
    Publisher: Department of Mines and Mineral Industries
    Object Type: GenericWork
    Date Uploaded: 2015-11-11T21:00:13Z