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  1. 1
    Two-hundred-fifty versus 500 volts or more for circuits in gassy coal mines

    Two-hundred-fifty versus 500 volts or more for circuits in gassy coal mines

    Published 1932
    “…[publisher not identified],…”
    Government Document Microfilm Book
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  2. 2
    Coal-mine safety organization

    Coal-mine safety organization

    Published 1927
    “…[publisher not identified],…”
    Government Document Microfilm Book
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  3. 3
    Area of unsupported roof in coal mines; conditions and factors for consideration

    Area of unsupported roof in coal mines; conditions and factors for consideration

    Published 1927
    “…[publisher not identified],…”
    Government Document Microfilm Book
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  4. 4
    Timbering along robbing line; factors influencing falls of roof in coal mines

    Timbering along robbing line; factors influencing falls of roof in coal mines

    Published 1927
    “…[publisher not identified],…”
    Government Document Microfilm Book
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  5. 5
    Practical application and cost of proper rock-dusting

    Practical application and cost of proper rock-dusting

    Published 1930
    “…[publisher not identified],…”
    Government Document Microfilm Book
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  6. 6
    What do we know about explosibility of coal dust in mines?

    What do we know about explosibility of coal dust in mines?

    Published 1929
    “…[publisher not identified],…”
    Government Document Microfilm Book
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  7. 7
    Sampling dust in rock-dusted mines

    Sampling dust in rock-dusted mines

    Published 1929
    “…[publisher not identified],…”
    Government Document Microfilm Book
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