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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

Falls of roof and coal in bituminous coal-mines

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

The National Safety Competition to assist in the reduction of mine and quarry accidents

The National safety competition of 1930

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

The National safety competition of 1931

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

The National safety competition of 1932

The National safety competition of 1935

The national safety competition of 1936

National safety competition of 1937

National safety competition of 1938


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