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    First national mine-safety demonstration, Pittsburgh, Pa., Oct. 30 and 31, 1911; with chapter on explosion at experimental mine

    First national mine-safety demonstration, Pittsburgh, Pa., Oct. 30 and 31, 1911; with chapter on explosion at experimental mine

    Published 1912
    “…Pittsburgh (Pa.) http://id.loc.gov/authorities/names/n79054720.…”
    Government Document Microfilm Book
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