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  1. 1
    Boron and its compounds

    Boron and its compounds

    Published 1931
    “…[publisher not identified],…”
    Government Document Microfilm Book
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  2. 2
    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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  3. 3
    Coal-mine safety organization

    Coal-mine safety organization

    Published 1927
    “…[publisher not identified],…”
    Government Document Microfilm Book
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  4. 4
    What mine foreman can do to prevent injury from falls of roof in coal mines

    What mine foreman can do to prevent injury from falls of roof in coal mines

    Published 1930
    “…[publisher not identified],…”
    Government Document Microfilm Book
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  5. 5
    Methods and costs of milling feldspar at Minpro plant, Tennessee Mineral Products Corporation, Spruce Pine, N.C

    Methods and costs of milling feldspar at Minpro plant, Tennessee Mineral Products Corporation, Spruce Pine, N.C

    Published 1931
    “…[publisher not identified],…”
    Government Document Microfilm Book
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  6. 6
    Mining practices, methods, and costs at mine No. 5 of Marquette Range, Mich

    Mining practices, methods, and costs at mine No. 5 of Marquette Range, Mich

    Published 1930
    “…[publisher not identified],…”
    Government Document Microfilm Book
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  7. 7
    Electrical safety inspection suggestions for mine-safety engineers.

    Electrical safety inspection suggestions for mine-safety engineers.

    Published 1929
    “…[publisher not identified],…”
    Government Document Microfilm Book
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  8. 8
    Mining laws of Germany (Prussia)

    Mining laws of Germany (Prussia)

    Published 1930
    “…[publisher not identified],…”
    Government Document Microfilm Book
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  9. 9
    Mining laws of Netherlands

    Mining laws of Netherlands

    Published 1931
    “…[publisher not identified],…”
    Government Document Microfilm Book
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  10. 10
    Tunnel driving methods used at Ojuela unit of Compania Minera de Penoles, S. A., Ojuela, Durango, Mexico

    Tunnel driving methods used at Ojuela unit of Compania Minera de Penoles, S. A., Ojuela, Durango, Mexico

    Published 1931
    “…[publisher not identified],…”
    Government Document Microfilm Book
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  11. 11
    Work of Holmes Safety Association in State of Washington

    Work of Holmes Safety Association in State of Washington

    Published 1929
    “…[publisher not identified],…”
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  12. 12
    Compendium on limes in hydrometallurgy and flotation

    Compendium on limes in hydrometallurgy and flotation

    Published 1931
    “…[publisher not identified],…”
    Government Document Microfilm Book
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  13. 13
    Gas explosion in rock-dusted mine

    Gas explosion in rock-dusted mine

    Published 1929
    “…[publisher not identified],…”
    Government Document Microfilm Book
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  14. 14
    Mining laws of Latvia

    Mining laws of Latvia

    Published 1931
    “…[publisher not identified],…”
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  15. 15
    Movement of oil through Panama Canal

    Movement of oil through Panama Canal

    Published 1926
    “…[publisher not identified],…”
    Government Document Microfilm Book
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  16. 16
    Some notes on underground transportation

    Some notes on underground transportation

    Published 1931
    “…[publisher not identified],…”
    Government Document Microfilm Book
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  17. 17
    Sampling and exploration by means of hammer drills

    Sampling and exploration by means of hammer drills

    Published 1932
    “…[publisher not identified],…”
    Government Document Microfilm Book
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  18. 18
    Conservation of natural gas in relation to some recent developments

    Conservation of natural gas in relation to some recent developments

    Published 1930
    “…[publisher not identified],…”
    Government Document Microfilm Book
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  19. 19
    Shaft-sinking methods, practices, and costs of Consolidation Coal Co. at its No. 261 mine, Caretta, McDowell County, W.Va

    Shaft-sinking methods, practices, and costs of Consolidation Coal Co. at its No. 261 mine, Caretta, McDowell County, W.Va

    Published 1932
    “…[publisher not identified],…”
    Government Document Microfilm Book
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  20. 20
    Consumption of primary or virgin tin in U.S

    Consumption of primary or virgin tin in U.S

    Published 1928
    “…[publisher not identified],…”
    Government Document Microfilm Book
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