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  1. 1
    Coal-mine timbering : Technical information for use in vocational classes.

    Coal-mine timbering : Technical information for use in vocational classes.

    Published 1931
    Subjects:
    Full Text (via ProQuest)
    Government Document eBook
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  2. 2
    Coal-mine ventilation : Technical information for use in vocational training classes.

    Coal-mine ventilation : Technical information for use in vocational training classes.

    Published 1931
    Subjects: “…Mines and mineral resources.…”
    Full Text (via ProQuest)
    Government Document eBook
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  3. 3
    General mining.

    General mining.

    Published 1919
    Subjects: “…Mines and mineral resources.…”
    Full Text (via ProQuest)
    Government Document eBook
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