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U.S. Department of Interior, Bureau of Mines books with free versions
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Accuracy and Precision of Several Portable Gas Detectors

Herbert B. Carroll and Frederick E. Armstrong

AVAILABLE!
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Herbert B. Carroll and Frederick E. Armstrong

Analyses of Tipple and Delivered Samples of Coal

United States. Bureau of Mines. Staff, Coal Sampling and Inspection

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United States. Bureau of Mines. Staff, Coal Sampling and Inspection
AVAILABLE!
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Coal Mine Roof Rating (CMRR)

Gregory M. Molinda and Christopher Mark

AVAILABLE!
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Gregory M. Molinda and Christopher Mark
AVAILABLE!
Book cover
AVAILABLE!
Book cover