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Production of explosives in the United States during the calendar year 1914 :with notes on coal mine accidents due to explosives

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

Production of explosives in the United States during the calendar year 1930

Falls of roof and coal in mines operating in the Pittsburgh coal bed in Marion and Monongalia counties, W. Va.

Falls of roof and coal in mines operating in the Sewickley coal bed in Monongalia County, W. Va.

Production of explosives in the United States :during the calendar year 1931

Falls of roof and coal in mines operating in the Pittsburgh Coal Bed, Panhandle District, West Virginia

Falls of roof in mines operating in the Pittsburgh Coal Bed, West Virginia


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