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    Sinking Large-Diameter Drill Holes, Lake Superior District Underground Iron Mines.

    Published 1946
    “…I 28.27:7354…”
    Full Text (via ProQuest)
    Government Document eBook

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  2. 2
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    Sinking large-diameter drill holes, Lake Superior district underground iron mines / by Johnson, Ernest W. (Ernest William), 1890-

    Published 1946
    “…I 28.27:7354…”
    Search for the full-text version of this title in HathiTrust
    Government Document Book

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