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  1. 1
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    Electric Blasting Switches, Underground Mines, Lake Superior District.

    Published 1946
    “…I 28.27:7372…”
    Full Text (via ProQuest)
    Government Document eBook

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  2. 2
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    Electric blasting switches, underground mines, Lake Superior district / by Petersen, Max S.

    Published 1946
    “…I 28.27:7372…”
    Search for the full-text version of this title in HathiTrust
    Government Document Book

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