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Production of explosives in the United States during the calendar year 1922 :with notes on mine accidents due to explosives

Coal-mine fatalities in the United States, 1922

Production of explosives in the United States during the calendar year 1923 :with notes on mine accidents due to explosives

Production of explosives in the United States :during the calendar year 1924 : with notes on mine accidents due to explosives

Production of explosives in the United States :during the calendar year 1925 : with notes on mine accidents due to explosives

Production of explosives in the United States :during the calendar year 1926 : with notes on mine accidents due to explosives

Production of explosives in the United States :during the calendar year 1927

Falls of roof in bituminous coal mines :influence of the seasons and rate of production


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