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Explosives used 4
Testa of the method 13
Publications on coal mining 19
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300-day workers A. H. Fay acid amount analysis anthracite boiler Bulletin Bureau of Mines calendar camera lucida carbon monoxide causes cent Clarence Hall coal mines coke combustion compiled by A. H. condensation cost December 31 decisions on mines determined distillation draft electric employed engine explosives F. K. Ovitz F. M. Seibert Fatalities and injuries figs filter fires fuel furnace G. A. Burrell gases gasoline Government Printing Office grade grains H. H. Clark Haulage heat Henry Kreisinger hole hydrochloric acid hydrofluoric acid hydrogen inches J. H. White J. W. Thompson kaolin lead chloride live steam Metal mines metallurgical method microscope Miners mixtures molybdenite MoS2 natural gas number killed obtained operators organic carbon organic hydrogen percentage pig iron pounds pressure publications quarries residue sample shale siliceous slag smelters Superintendent of Documents Table Technical Paper temperature tion trap tube United valve vapor